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go-ahead (adj.)
[go-ahead 词源字典]
by 1840, "pushing, driving," from verbal phrase
go ahead
; see
go
(v.) +
ahead
(adv.).
Go ahead
as a command or invitation to proceed is from 1831, American English.
[go-ahead etymology, go-ahead origin, 英语词源]
[go-ahead 词源字典]