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.
Words nearby smart as a whip
smaragdite,
smarm,
smarmy,
smart,
smart aleck,
smart as a whip,
smart ass,
smart bomb,
smart card,
smart casual,
smart drink