Leftover

wiktionary

ref

From left(“remaining, abandoned”) + over(“excess”)

etymonline

ref

leftover (adj.)

also left-over, "remaining, not used up," 1890, from left + over. The noun meaning "something left over" is from 1891; leftovers "excess food after a meal" (especially if re-served later) is from 1878; in this sense Old English had metelaf.