steel trap Edit
Noun
    an acute intelligence (an analogy based on the well-known sharpness of steel traps)
eg: he's as sharp as a steel trap

steel trap Edit
Noun
    an acute intelligence (an analogy based on the well-known sharpness of steel traps)
eg: a mind like a steel trap

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