English

flycop

From fly (“quick-witted”) + cop (“police officer”).

A compound of fly ‘quick-witted’ + cop ‘police officer’

Proto-Indo-European *plew- ‘to fly, flow, run’

…

Proto-Germanic *fleugǭ ‘flying insect, fly’

Proto-West Germanic *fleugā ‘fly’

Old English flēge ‘a fly’

Middle English fflye

English fly

English copper ‘police officer’

English cop

Today it means

noun A clever police officer with plenty of experience.

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