Etymology
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go-ahead (adj.)

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.

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Definitions of go-ahead

go-ahead (n.)
a signal to proceed;
Synonyms: green light
go-ahead (n.)
readiness to embark on bold new ventures;
Synonyms: enterprise / enterprisingness / initiative
From wordnet.princeton.edu