English

acock

From a- + cock.

A compound of a- + cock

Proto-Indo-European *uds- ‘up, out’

Proto-Germanic *uz- ‘out-’

Proto-West Germanic *uʀ- ‘up, out, over’

English a-

Proto-Germanic *kukkaz

Proto-West Germanic *kokk ‘cock, rooster, chicken’

Old English cocc

Middle English cok ‘rooster, cock’

English cock

Today it means

adv In a cocked or turned-up fashion.

Language periods are conventional ranges, not dates for this word.