late 14c., "loose outer garment," perhaps from Old English oferslop "surplice," which seems to be related to Middle Dutch slop, Old Norse sloppr (either of which also might be the source of the Middle English word), perhaps all from Proto-Germanic *slup-, from PIE root *sleubh- "to slide, slip" on the notion of a garment one "slips" on or into (compare sleeve). Sense extended generally to "clothing, ready-made clothing" (1660s), usually in plural slops. Hence, also, slop-shop "shop where ready-made clothes are sold" (1723).
"working or acting for reward, serving only for gain," hence "resulting from sordid motives, ready to accept dishonorable gain," 1530s, from mercenary (n.), or in part from Latin mercenarius "hired, paid, serving for pay."
"with or on condition that; this (or it) being understood, conceded, or established," early 15c., conjunction use of past participle of provide. As an adjective, "destined" (early 15c.); "prepared, ready" (1570s); "furnished" (1878).
"ready for action, unafraid, and up to the task;" probably literally "spirited as a game-cock," 1725, from game-cock "bird bred for fighting" (1670s), from game (n.) in the "sport, amusement" sense. Middle English adjectives gamesome, gamelich meant "joyful, playful, sportive."
"a collection of tools, utensils, etc. adapted as a means to some end," 1620s, from Latin apparatus "tools, implements, equipment; preparation, a preparing," noun of state from past-participle stem of apparare "prepare," from ad "to" (see ad-) + parare "make ready" (from PIE root *pere- (1) "to produce, procure").
late 15c., from French esclicier, from Old French escliz (see slice (n.)). Golfing sense is from 1890. Related: Sliced; slicing. Sliced bread is attested from 1929 and was touted in advertisements; greatest thing since ... first attested 1969.
With the advent of ready sliced bread the bread board, the bread knife and the slicing machine pass out of the picture. Sliced bread is a radical departure in the baking industry and although the Weber Baking Company will continue to supply the trade with unsliced loaves, the company anticipates an unusual run on the ready sliced loaf. [Western Hospital Review, vol. xiv, 1929]
No matter how thick or how thin you slice it it's still baloney. [Carl Sandburg, "The People, Yes," 1936]