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advantage [advantage 词源字典]: advantage: [14] Advantage comes from Old French avantage, which was based on avant ‘before’; the notion behind its formation was of being ahead of others, and hence in a superior position. As with advance, the intrusive -dbecame established in the 16th century, on the analogy of words genuinely containing the Latin prefix ad-. The reduced form vantage actually predates advantage in English, having entered the language via Anglo-Norman in the 13th century.
[advantage etymology, advantage origin, 英语词源]
leap year: leap year: [14] The inspiration for the term leap year is probably simply that in such a year the day on which any given date falls ‘jumps’ one day ahead of where it would have been in an ordinary year. The metaphorical application of the notion of ‘jumping’ to this phenomenon predates the first record of the term leap year: medieval Latin, for instance, used the term saltus lunae ‘moon’s jump’ for the nineteen-yearly omission of a day from the lunar calendar, and this was translated into Old English as mōnan hlyp ‘moon’s leap’.
ahead (adv.): 1620s, "at the head, in front," from a- "on" (see a- (1)) + head (n.). Originally nautical. To be ahead of (one's) time attested by 1837.
anticipate (v.): 1530s, "to cause to happen sooner," a back-formation from anticipation, or else from Latin anticipatus, past participle of anticipare "take (care of) ahead of time," literally "taking into possession beforehand," from ante "before" (see ante) + capere "to take" (see capable).

Later "to be aware of (something) coming at a future time" (1640s). Used in the sense of "expect, look forward to" since 1749, but anticipate has an element of "prepare for, forestall" that should prevent its being used as a synonym for expect. Related: Anticipated; anticipating.
anticipation (n.): late 14c., from Latin anticipationem (nominative anticipatio) "preconception, preconceived notion," noun of action from past participle stem of anticipare "take care of ahead of time" (see anticipate). Meaning "action of looking forward to" is from 1809.
backfire (n.): 1839, American English, originally "a fire deliberately lit ahead of an advancing prairie fire to deprive it of fuel," from back (adj.) + fire (n.). As a verb in this sense, recorded from 1886. The meaning "premature ignition in an internal-combustion engine" is first recorded 1897. Of schemes, plans, etc., "to affect the initiator rather than the intended object" it is attested from 1912, a figurative use from the accidental back-firing of firearms.