smart as a whip
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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.
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Which of the following nouns has an irregular plural form?
Words nearby smart as a whip
smarm, smarmy, smart, smart aleck, smartarse, smart as a whip, smart ass, smart bomb, smart card, smart casual, smart drink
The American Heritage® Idioms Dictionary
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