steel trap

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• March 3. 2016 from wordnet.princeton.edu

  steel trap — noun — english

  an acute intelligence (an analogy based on the well-known sharpness of steel traps); "he's as sharp as a steel trap"; "a mind like a steel trap"

• March 3. 2016 from wordnet.princeton.edu

  steel trap — noun — english

  a trap made of steel with a strong spring and sharp toothlike projections to hold the prey