• do one's bird

Originally Cockney rhyming slang, shortened frombird-lime for "time".

dobird (third-person singular simple presentdoes bird,present participledoing bird,simple pastdid bird,past participledone bird)

1. (UK,dated,informal) todo time(to serve aprisonsentence).

• “do bird” (UK) inMacmillan English Dictionary.
• “do bird” inLongman Dictionary of Contemporary English,Longman.
• “do bird”, inCambridge English Dictionary, Cambridge, Cambridgeshire:Cambridge University Press, 1999–present.
• “do bird”, inCollins English Dictionary.