up-market (adj.) Look up up-market at Dictionary.com
1972, from up- + market (n.).
up-river (prep.) Look up up-river at Dictionary.com
1773, from up + river. As an adverb from 1848.
up-to-date (adv.) Look up up-to-date at Dictionary.com
1840, "right to the present time," from phrase up to date, probably originally from bookkeeping. As an adjective from 1865. Meaning "having the latest facts" is recorded from 1889; that of "having current styles and tastes" is from 1891.
Upanishad (n.) Look up Upanishad at Dictionary.com
one of a class of speculative treatises in Sanskrit literature, 1805, from Sanskrit upa-nishad, literally "a sitting down beside." From upa "near to" (from PIE root *upo "under," also "up from under," hence also "over") + ni-shad "to sit or lie down," from ni "downward" (from PIE *ni-, see nether) + -sad "sitting," from PIE root *sed- (1) "to sit."
upas (n.) Look up upas at Dictionary.com
legendary poisonous tree of Java, 1783, via Dutch, from Malay (Austronesian) upas "poison," in pohun upas "poison tree." As the name of an actual tree (Antiaris toxicaria) yielding poisonous sap, from 1814.
upbeat (adj.) Look up upbeat at Dictionary.com
"with a positive mood," 1947, apparently from on the upbeat "improving, getting better," attested from 1934 and a favorite of "Billboard" headline-writers in the early 1940s, from the musical noun upbeat (1869), referring to the beat of a bar at which the conductor's baton is in a raised position; from up (adv.) + beat (n.). The "optimistic" sense apparently for no other reason than that it sounds like a happy word (the musical upbeat is no more inherently "positive" than any other beat).
upbraid (v.) Look up upbraid at Dictionary.com
Old English upbregdan "bring forth as a ground for censure," from up (adv.) + bregdan "move quickly, intertwine" (see braid (v.)). Similar formation in Middle Swedish upbrygdha. Meaning "scold" is first attested late 13c. Related: Upbraided; upbraiding.
upbringing (n.) Look up upbringing at Dictionary.com
1510s, "act of rearing a young person," from up (adv.) + bringing (see bring (v.)). Mainly in Scottish in 16c.; in general use from c. 1870, according to OED. A verb upbring (past participle upbrought) was in Middle English in a sense "raise, rear, bring up, nurture" (c. 1300), but in Middle English upbringing is attested only as "act of introducing" (c. 1400).
upchuck (v.) Look up upchuck at Dictionary.com
"to vomit," by 1960, American English slang, from up (adv.) + chuck (v.) "to throw."
upcoming (adj.) Look up upcoming at Dictionary.com
1848, "rising;" 1949, "forthcoming," from up (adv.) + present participle adjective from come (v.)). It was a noun in Middle English, meaning "action of ascending" (mid-14c.), also "attack, onslaught" (c. 1300).
update (v.) Look up update at Dictionary.com
1944, in reference to information, 1952 in reference to persons, from up (adv.) + date (v.1). Related: Updated; updating. The noun is attested from 1967.
updraft (n.) Look up updraft at Dictionary.com
also updraught, "rising air current," 1909, from up (adj.) + draft (n.).
upend (v.) Look up upend at Dictionary.com
also up-end, "set on end," 1823, from up + end. Related: Upended; upending.
upfield (adv.) Look up upfield at Dictionary.com
1951, from up (adv.) + field (n.).
upfront (adj.) Look up upfront at Dictionary.com
1932, up front "in the front," from up + front (n.). Meaning "honest, open" is from 1970; that of "paid in advance" is from 1967.
upgather (v.) Look up upgather at Dictionary.com
also up-gather, 1580s, from verbal phrase, from up (adv.) + gather (v.). Related: Upgathered; upgathering.
upgrade (n.) Look up upgrade at Dictionary.com
also up-grade, 1847, "upward slope," from up (adj.) + grade (n.). The meaning "upgraded version" is recorded from 1980.
upgrade (v.) Look up upgrade at Dictionary.com
"increase to a higher grade or rank," 1904 (transitive); 1950 (intransitive), from up (adv.) + grade (v.). Related: Upgraded; upgrading.
upheaval (n.) Look up upheaval at Dictionary.com
1834 in reference to convulsions in society; 1836 in geology, from verb upheave (c. 1300, from up (adv.) + heave (v.)) + -al (2). Similarly formed verbs are Old Frisian upheva, Old High German ufhevan, German aufheben.
upheld Look up upheld at Dictionary.com
past participle of uphold (q.v.).
uphill (adj.) Look up uphill at Dictionary.com
1610s, from up + hill (n.). As an adverb from c. 1600. Grose's "Dictionary of the Vulgar Tongue" (1785) has "Uphills, false dice that run high."
uphold (v.) Look up uphold at Dictionary.com
c. 1200, "support, sustain," from up (adv.) + hold (v.). Similar formation in Old Frisian upholda, Middle Dutch ophouden, German aufhalten. Meaning "maintain in good condition or repair" is from 1570s. Related: Upheld; upholding.
upholster (v.) Look up upholster at Dictionary.com
1853, back-formation from upholsterer. Related: Upholstered; upholstering.
upholsterer (n.) Look up upholsterer at Dictionary.com
"tradesman who finishes or repairs articles of furniture" (1610s), from upholdester (early 15c.; early 14c. as a surname), formed with diminutive (originally fem.) suffix -ster + obsolete Middle English noun upholder "dealer in small goods" (c. 1300), from upholden "to repair, uphold, keep from falling or sinking" (in this case, by stuffing); see uphold (v.).
upholstery (n.) Look up upholstery at Dictionary.com
"upholsterer's work, furniture covered with textile materials, interior fittings made from textiles," 1640s; see upholster + -y (4).
upkeep (n.) Look up upkeep at Dictionary.com
"maintenance; cost of maintenance," 1849, from verbal phrase keep up "maintain in good order or condition" (1660s); see up (adv.) + keep (v.).
upland (n.) Look up upland at Dictionary.com
"interior district of a country," Old English upland "the country" (as opposed to the town), from up- + land (n.). As an adjective from 14c. Related: Uplandish (Old English uplendisc "rural rustic"); uplander. Jock Upaland was a 16c.-17c. term for a rustic.
uplift (v.) Look up uplift at Dictionary.com
mid-14c., from up (adv.) + lift (v.). Related: Uplifted; uplifting.
uplift (n.) Look up uplift at Dictionary.com
1845, from up (adj.) + lift (n.).
uplink (n.) Look up uplink at Dictionary.com
1968, from up- + link (n.).
upload (v.) Look up upload at Dictionary.com
by 1980, from up (adv.) + load (v.). Related: Uploaded; uploading.
upon (prep.) Look up upon at Dictionary.com
early 12c., from Old English uppan (prep.) "on, upon, up to, against," from up (adv.) + on (prep.); probably influenced by Scandinavian sources such as Old Norse upp a.
upon (adv.) Look up upon at Dictionary.com
Old English upon; see up (adv.) + on (prep.).
upper (adj.) Look up upper at Dictionary.com
c. 1300, originally comparative of up (adj.). Similar formation in Middle Dutch upper, Dutch opper, Low German upper, Norwegian yppare.

Upper hand "advantage" is late 15c., perhaps from wrestling (get the over-hand in the same sense is from early 14c.); lower hand "condition of having lost or failed to win superiority" (1690s) is rare. Upperclassman is recorded from 1871. Upper crust is attested from mid-15c. in reference to the top crust of a loaf of bread, 1836 in reference to society. Upper middle class (adj.) is recorded from 1835. Upper ten thousand (1844) was common mid-19c. for "wealthier and more aristocratic part of a large community;" hence uppertendom.
upper (n.) Look up upper at Dictionary.com
"part of a shoe above the sole," 1789, from upper (adj.). Sense of "stimulant drug" is from 1968, agent noun from up (v.).
uppercut (n.) Look up uppercut at Dictionary.com
in pugilism, a close-in strike upward with the fist, 1831, from upper + cut (n.). Perhaps the image is of chopping a tree by making cuts up (as well as down) in the trunk.
It was on a side hill, and I observed a boy, who appeared to be about fifteen years of age, opposite the house felling a large tree; he had cut a few chips from the under side, and was then making the principal incision on the upper. ... I said to the boy, "Well Sir, I see that you make the upper cut." "That is the true cut," said the boy; "for if you will take the axe and try below, you will find that the tree will crowd down upon your chips, and you can't get it down in double the time." [Theodore Sedgwick, "Hints to My Countrymen," 1826]
uppermost (adj.) Look up uppermost at Dictionary.com
mid-15c., from upper (adj.) + -most.
uppish (adj.) Look up uppish at Dictionary.com
1670s, "lavish," from up (adv.) + -ish. Sense of "conceited, arrogant, proudly self-assertive" attested from 1734. Related: Uppishly; uppishness.
uppity (adj.) Look up uppity at Dictionary.com
1880, American English, from up + -ity; originally used by blacks of other blacks felt to be too self-assertive (first recorded use is in "Uncle Remus").
upraise (v.) Look up upraise at Dictionary.com
c. 1300, from up (adv.) + raise (v.). Related: Upraised; upraising.
upright (adj.) Look up upright at Dictionary.com
Old English upriht "erect, face-upward;" see up (adv.) + right (adj.1). Similar compounds are found in other Germanic languages (Old Frisian upriucht, Middle Dutch oprecht, Old High German ufreht, German aufrecht, Old Norse uprettr). Figurative sense of "good, honest, adhering to rectitude" is first attested 1520s.

As an adverb, Old English uprihte. As a noun, 1560s in the sense "a vertical front;" c. 1700 as "a vertical timber in framing;" 1742 in the sense "something standing erect." Meaning "an upright piano" is from 1860.
THREE-PENNY UPRIGHT. A retailer of love, who, for the sum mentioned, dispenses her favours standing against a wall. ["Dictionary of the Vulgar Tongue," 1811]

The bent-over rear-entry posture they are talking about, of course, is kubda, the three-obol position at the bottom-end of a prostitute's price-range. [James N. Davidson, "Courtesans and Fishcakes: The Consuming Passions of Classical Athens," 1997]
uprise (v.) Look up uprise at Dictionary.com
c. 1300, "stand up; get out of bed; ascend to a higher level," from up (adv.) + rise (v.). Similar formation in West Frisian oprize, Middle Dutch oprisen, Dutch oprijzen.
uprising (n.) Look up uprising at Dictionary.com
mid-13c., "action of rising from death or the grave, resurrection," from up (adv.) + rising (n.). Meaning "action of rising from bed" is recorded from c. 1300; sense of "insurrection, popular revolt" first attested 1580s.
uproar (n.) Look up uproar at Dictionary.com
1520s, "outbreak of disorder, revolt, commotion," used by Tindale and later Coverdale as a loan-translation of German Aufruhr or Dutch oproer "tumult, riot," literally "a stirring up," in German and Dutch bibles (as in Acts xxi.38). From German auf (Middle Dutch op) "up" (see up (adv.)) + ruhr (Middle Dutch roer) "a stirring, motion," related to Old English hreran "to move, stir, shake" (see rare (adj.2)). Meaning "noisy shouting" is first recorded 1540s, probably by mistaken association with unrelated roar.
uproarious (adj.) Look up uproarious at Dictionary.com
1791, from uproar + -ous. Related: Uproariously.
uproot (v.) Look up uproot at Dictionary.com
1590s (implied in uprooted), in the figurative sense, from up (adv.) + root (v.). The literal sense is first recorded 1690s. Related: Uprooted; uprooting.
upscale (adj.) Look up upscale at Dictionary.com
1966, "at the higher end of a scale, superior," a commercial word, from up (adv.) + scale (v.3).
upset (v.) Look up upset at Dictionary.com
mid-15c., "to set up, fix," from up (adv.) + set (v.). Similar formation in Middle Dutch opsetten "set up, propose," German aufsetzen. Modern sense of "overturn, capsize" (1803) is that of obsolete overset. In reference to the stomach, from 1834. Meaning "to throw into mental discomposure" is from 1805. Related: Upsetting.
upset (n.) Look up upset at Dictionary.com
early 15c., "insurrection," from upset (v.). Meaning "overturning of a vehicle or boat" is recorded from 1804.
upset (adj.) Look up upset at Dictionary.com
early 14c., "erected," past participle adjective from upset (v.). From 1805 as "distressed."