smart as a whip
Very intelligent or clever, as in Little Brian is smart as a whip; he's only three and already learning to read. This simile alludes to the sharp crack of a whip. [Mid-1900s] Also see mind like a steel trap.
|smart as a whip|
|having or marked by unusual and impressive intelligence; "some men dislike brainy women"; "a brilliant mind"; "a brilliant solution to the problem" [syn: brainy]|