English

acop

From a- + cop (“crown of the head”).

Formed from a- + cop ‘crown of the head’

Proto-Indo-European *uds- ‘up, out’

Proto-Germanic *uz- ‘out-’

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

English a-

English copper ‘police officer’

English cop

Today it means

adv atop

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