Etymology
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fancy (n.)

mid-15c., fantsy "inclination, liking," contraction of fantasy. It took the older and longer word's sense of "inclination, whim, desire." Meaning "the productive imagination" is from 1580s. That of "a fanciful image or conception" is from 1660s. Meaning "fans of an amusement or sport, collectively" is attested by 1735, especially (though not originally) of the prize ring. The adjective is recorded from 1751 in the sense "fine, elegant, ornamental" (opposed to plain); later as "involving fancy, of a fanciful nature" (1800). Fancy man attested by 1811.

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fancy (v.)

"take a liking to," 1540s, a contraction of fantasien "to fantasize (about)," from fantasy (n.). Meaning "imagine" is from 1550s. Related: Fancied; fancies; fancying. Colloquial use in fancy that, etc. is recorded by 1813.

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up (n.)

"that which is up," 1530s, from up (adv.). Phrase on the up-(and-up) "honest, straightforward" first attested 1863, American English.

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fancy-free (adj.)

"free from the trammels of love, having the 'fancy' or affection free," 1580s, from fancy (n.) + free (adj.).

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up (adv.)

Old English up, uppe, from Proto-Germanic *upp- "up" (source also of Old Frisian, Old Saxon up "up, upward," Old Norse upp; Danish, Dutch op; Old High German uf, German auf "up"; Gothic iup "up, upward," uf "on, upon, under;" Old High German oba, German ob "over, above, on, upon"), from PIE root *upo "under," also "up from under," hence also "over."

As a preposition, "to a higher place" from c. 1500; also "along, through" (1510s), "toward" (1590s). Often used elliptically for go up, come up, rise up, etc. Up the river "in jail" first recorded 1891, originally in reference to Sing Sing, which is up the Hudson from New York City. To drive someone up the wall (1951) is from the notion of the behavior of lunatics or caged animals. Insulting retort up yours (scil. ass) is attested by late 19c.

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up- 

prefix with various senses, from Old English up (adv.), corresponding to similar prefixes in other Germanic languages.

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up (v.)

1550s, "to drive and catch (swans)," from up (adv.). Intransitive meaning "get up, rise to one's feet" (as in up and leave) is recorded from 1640s. Sense of "to move upward" is recorded from 1737. Meaning "increase" (as in up the price of oil) is attested from 1915. Compare Old English verb uppian "to rise up, swell." Related: Upped; upping. Upping block, used for mounting or dismounting horses, carriages, etc., is attested from 1796 (earlier was horsing-block, 1660s).

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up (adj.)

c. 1300, "dwelling inland or upland," from up (adv.). Meaning "going up" is from 1784. From 1815 as "excited, exhilarated, happy," hence "enthusiastic, optimistic." Up-and-coming "promising" is from 1848. Musical up-tempo (adj.) is recorded from 1948.

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mark-up (n.)

also markup, "amount added by a retailer to cover overhead and provide profit," 1899, from the verbal phrase in this sense (by 1870); see mark (v.) + up (adv.).

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grow up (v.)

"advance toward maturity," 1530s, from grow (v.) + up (adv.). As a command to be sensible, from 1951.

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