steel trap

Noun
  1. An acute intelligence (an analogy based on the well-known sharpness of steel traps) (synset 105628537)
    "he's as sharp as a steel trap"; "a mind like a steel trap"
    is a type of: acuity, acuteness, keenness, sharpness - a quick and penetrating intelligence
  2. A trap made of steel with a strong spring and sharp toothlike projections to hold the prey (synset 104319011)
    is a type of: trap - a device in which something (usually an animal) can be caught and penned

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