tinker (v.)
1590s, "to work as a tinker," from tinker (n.). Meaning "work imperfectly, keep busy in a useless way," is first found 1650s. Related: Tinkered; tinkering.
tinkle (v.)
"to make a gentle ringing sound," late 14c., possibly a frequentative form of tinken "to ring, jingle," perhaps of imitative origin. Meaning "to urinate" is recorded from 1960, from childish talk. Related: Tinkled; tinkling. As a noun from 1680s.
tinman (n.)
"tinsmith," 1610s, from tin (n.) + man (n.).
tinnitus (n.)
1843, from Latin tinnitus "a ringing, jingling," from tinnire "to ring, tinkle" (see tintinnabulation).
tinny (adj.)
1550s, "of tin," from tin + -y (2). Used figuratively (of sounds, etc.) since 1877.
tinsel (n.)
mid-15c., "a kind of cloth made with interwoven gold or silver thread," from Middle French estincelle "spark, spangle" (see stencil (n.)). "In 14-15th c. Fr., the s of es- had long been mute" [OED]. Meaning "very thin sheets or strips of shiny metal" is recorded from 1590s. Figurative sense of "anything showy with little real worth" is from 1650s, suggested from at least 1590s. First recorded use of Tinseltown for "Hollywood" is from 1972.
tinsmith (n.)
1785, from tin + smith (n.).
tint (n.)
"color," 1717, alteration of tinct (c.1600), from Latin tinctus "a dyeing," from tingere "to dye" (see tincture); influenced by Italian tinta "tint, hue," from Latin tinctus.
tint (v.)
1756 (implied in tinted), from tint (n.). Related: Tinting.
tintinnabulation (n.)
"the ringing of bells," 1823, from Latin tintinnabulum "bell," from tintinnare "to ring, jingle" (reduplicated form of tinnire "to ring," from an imitative base) + instrumental suffix -bulum. Earlier forms in English were adjectives tintinnabulary (1787), tintinnabulatory (1827), and noun tintinnabulum "small bell" (late 14c.).
tiny (adj.)
1590s, from tyne "very small" (c.1400, perhaps from tine) + -y (2).
Tioga
place in New York state, from Mohawk (Iroquoian) teyo:ke "junction, fork."
tip (v.1)
c.1300, "to knock down, overturn, topple, knock askew" (transitive), of uncertain origin, possibly from Scandinavian (compare Swedish tippa "to tip, dump"), or from a special use of tip (n.). Intransitive sense of "to fall over, be overturned" is from mid-15c. Related: Tipped; tipping. To tip the scales at "weigh (so much" is from 1879. Tipping point attested by 1972. To tip (one's) hand "reveal one's intentions" is from 1907, an image from poker-playing.
tip (n.1)
c.1400, "extreme end of something, top of something round or pointed, metal attachment to the end of something," from Middle Low German or Middle Dutch tip "utmost point, extremity, tip" (compare German zipfel, a diminutive formation); or from a Scandinavian source (compare Old Norse typpi).
tip (v.2)
"give a small present of money to," c.1600, originally "to give, hand, pass," thieves' cant, perhaps from tip (v.3) "to tap." The meaning "give a gratuity to" is first attested 1706. The noun in this sense is from 1755; the noun meaning "piece of confidential information" is from 1845; and the verb in the sense "give private information to" is from 1883.

The word's supposed origin as an acronym is highly unlikely and the story seems to be no older than an editorial in "Life" magazine from July 15, 1946, claiming the restaurant server's word tip "probably comes from a London coffeehouse custom of two centuries ago when the words 'To Insure Promptness' were written on notes to the waiter, with coins attached. Later just the initials T.I.P. were used." There is no historical evidence for this. Also see here.
tip (v.3)
c.1200, "to strike, occur suddenly," of uncertain origin, possibly from Low German tippen "to poke, touch lightly," related to Middle Low German tip "end, point," and thus connected to tip (n.); or else related to tap (v.1). Meaning "strike sharply but lightly" is from 1560s. Sports sense is from 1816, originally in cricket. Related: Tipped; tipping.
tip (n.2)
"a light, sharp blow or tap," mid-15c., from tip (v.3).
tip (v.4)
"put a tip on, adorn with a tip," late 14c., from tip (n.) or Old Norse typpa. Related: Tipped; tipping.
tip-off (n.)
1901 in reference to information, from tip (v.2) + off (adv.). From 1924 in basketball, from tip (v.3).
tip-top (n.)
"extreme top," 1702, from tip (n.1) + top (n.1). Hence, "most excellent."
Tipperary
place in Ireland, from Irish Tiobraid Arann "well of the Ara (river)."
tippet (n.)
c.1300, of unknown origin; perhaps from Old English tæppet "carpet, hanging."
tipple (v.)
c.1500 (implied in tippling), "sell alcoholic liquor by retail," of unknown origin, possibly from a Scandinavian source (such as Norwegian dialectal tipla "to drink slowly or in small quantities"). Meaning "drink (alcoholic beverage) too much" is first attested 1550s. Related: Tippled.
tippler (n.)
late 14c., "seller of alcoholic liquors," of uncertain origin (see tipple). In the sense of "habitual drinker" it dates from 1570s.
tipstaff (n.)
1540s, "tipped staff" (truncheon with a tip or cap of metal) carried as an emblem of office, from tip (n.) + staff (n.). As the name of an official who carries one (especially a sheriff's officer, bailiff, constable, court crier, etc.) it is recorded from 1560s.
tipster (n.)
"one who provides private information," 1862, from tip (v.2) + -ster.
tipsy (adj.)
1570s, from tip (v.1); compare drowsy, flimsy, tricksy. Later associated with tipple. Tipsy-cake (1806) was stale cake saturated with wine or liquor.
tiptoe (n.)
late 14c., from tip (n.1) + toe (n.). As an adverb from 1590s; as a verb from 1630s. Related: Tiptoes (late 14c.), also tiptoon; tip-toed. Tippy-toes is from 1820.
tirade (n.)
"a long, vehement speech, a 'volley of words,' " 1801, from French tirade "a volley, a shot; a pull; a long speech or passage; a drawing out" (16c.), from tirer "draw out, endure, suffer," or the French noun is perhaps from or influenced by cognate Italian tirata "a volley," from past participle of tirare "to draw." The whole Romanic word group is of uncertain origin. Barnhart suggests it is a shortening of the source of Old French martirer "endure martyrdom" (see martyr).
tire (v.1)
"to weary," also "to become weary," Old English teorian (Kentish tiorian) "to fail, cease; become weary; make weary, exhaust," of uncertain origin, not found outside English. Related: Tired; tiring.
tire (n.)
late 15c., "iron plates forming a rim of a carriage wheel," probably from tire "equipment, dress, covering" (c.1300), a shortened form of attire (n.). The notion is of the tire as the dressing of the wheel. The original spelling was tyre, which had shifted to tire in 17c.-18c., but since early 19c. tyre has been revived in Great Britain and become standard there. Rubber ones, for bicycles (later automobiles) are from 1877. A tire-iron originally was one of the iron plates; as a device for separating a tire from a wheel, by 1909.
tire (v.2)
"furnish with a tire," 1899, from tire (n.).
tired (adj.)
"exhausted, fatigued, weary," early 15c., past participle adjective from tire (v.).
tiredness (n.)
1550s, from tired + -ness.
tireless (adj.)
1590s, "indefatigable," from tire (v.) + -less. From 1862 in the sense "without a tire," from tire (n.). Related: Tirelessly.
tiresome (adj.)
"tedious," c.1500, from tire (v.) + -some (1). Related: Tiresomely; tiresomeness.
Tironian
of or pertaining to Marcus Tullius Tiro, Cicero's scribe and namesake, 1828, especially in reference to the Tironian Notes (Latin notæ Tironianæ), a system of shorthand said to have been invented by him (see ampersand).
Although involving long training and considerable strain on the memory, this system seems to have practically answered all the purposes of modern stenography. It was still in familiar use as late as the ninth century. [Century Dictionary]
tisane (n.)
medicinal tea, 1931, from French tisane; earlier ptisan (14c.), from Latin ptisana, from Greek ptisane "crushed barley," related to ptissein "to winnow, crush, peel" (see pestle).
tissue (n.)
mid-14c., "band or belt of rich material," from Old French tissu "a ribbon, headband, belt of woven material" (c.1200), noun use of tissu "woven, interlaced," past participle of tistre "to weave," from Latin texere "to weave, to make" (see texture (n.)). The biological sense is first recorded 1831, from French, introduced c.1800 by French anatomist Marie-François-Xavier Bichal (1771-1802). Meaning "piece of absorbent paper used as a handkerchief" is from 1929. Tissue-paper is from 1777, supposedly so called because it was made to be placed between tissues to protect them.
tit (n.1)
"breast," Old English titt "teat, nipple, breast" (a variant of teat). But the modern slang tits (plural), attested from 1928, seems to be a recent reinvention, used without awareness of the original form, from teat or from dialectal and nursery diminutive variant titties (pl.).
tit (n.2)
1540s, a word used for any small animal or object (as in compound forms such as titmouse, tomtit, etc.); also used of small horses. Similar words in related senses are found in Scandinavian (Icelandic tittr, Norwegian tita "a little bird"), but the connection and origin are obscure; perhaps, as OED suggests, the word is merely suggestive of something small. Used figuratively of persons after 1734, but earlier for "a girl or young woman" (1590s), often in deprecatory sense of "a hussy, minx."
tit for tat
1550s, possibly an alteration of tip for tap "blow for blow," from tip (v.3) "tap" + tap "touch lightly." Perhaps influenced by tit (n.2).
titan (n.)
early 15c., from Latin titan, from Greek titan, member of a mythological race of giants who attempted to scale heaven by piling Mount Pelion on Mount Ossa but were overthrown by Zeus and the other gods. They descended from Titan, elder brother (or grandson) of Kronos. The name is perhaps from tito "sun, day," which probably is a loan-word from a language of Asia Minor. Sense of "person or thing of enormous size or ability" first recorded 1828. Applied to planet Saturn's largest satellite in 1831; it was discovered 1655 by Dutch astronomer Christiaan Huygens, who named it Saturni Luna "moon of Saturn." Related: Titaness; titanian.
titanic (adj.)
"gigantic, colossal," 1709, from titan + -ic. The British passenger liner R.M.S. Titanic sank April 15, 1912, and the name became symbolic of the destruction of supposedly indestructible.
titanium (n.)
metallic element, 1796, Modern Latin, named in 1795 by German chemist and mineralogist Martin Heinrich Klaproth (1743-1817) from Latin Titan (see titan) as "sons of the earth." He previously had named uranium. A pure specimen was not isolated until 1887.
tithe (n.)
a tenth part (originally of produce) due as support of the clergy, c.1200, from Old English teogoþa (Anglian), teoþa (West Saxon) "tenth," from Proto-Germanic *teguntha, from PIE *dekmto-, from *dekm "ten" (see ten). Retained in ecclesiastical sense while the form was replaced in ordinal use by tenth.
tithe (v.)
Old English teoþian "to pay one-tenth," from the root of tithe (n.). As "to impose a payment of a tenth," late 14c. Related: Tithed; tithing.
tither (n.)
late 14c., "one who pays a tithe," agent noun from tithe (v.). As "one who exacts a tithe," 1590s.
titi (n.)
type of small South American monkey, 1832, from native name in Tupi, probably imitative.
Titian (n.)
1824, "a painting by Venetian painter Tiziano Vecellio" (c.1490-1576), from Anglicized form of his name. Often also in reference to the tint of bright auburn hair favored by him in his work.