(as) sharp as a steel trap

(as) sharp as a steel trap

Able to understand or grasp information quickly. David's as sharp as a steel trap, so if you give him the instructions, he'll follow them perfectly. My grandmother became very physically incapacitated as she grew older, but her mind was as sharp as a steel trap until the day she died. Is he really pulling a door that's clearly marked "push"? Not exactly sharp as a steel trap, is he?

See also: sharp, steel, trap

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