The house sparrow, Passer domesticus; a small bird with a short bill, and brown, white and gray feathers.
A member of the family Passeridae, comprising small Old World songbirds.
A member of the family Emberizidae, comprising small New World songbirds.
Generically, any small, nondescript bird.
A quick-witted, lively person. Often used in the phrase cockney sparrow.