Akademik

steel trap
noun
1. an acute intelligence (an analogy based on the well-known sharpness of steel traps) (Freq. 1)
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he's as sharp as a steel trap

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a mind like a steel trap

Hypernyms: ↑acuteness, ↑acuity, ↑sharpness, ↑keenness
2. a trap made of steel with a strong spring and sharp toothlike projections to hold the prey
Hypernyms: ↑trap

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a trap for catching animals, consisting of spring-operated steel jaws with sharp projections that clamp shut.
[1725-35]

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steel trap noun
One with steel jaws and spring
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Main Entry:steel

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steel trap,
a trap with jaws and spring of steel.
steel-trap «STEEL TRAP», adjective.
resembling or suggesting a steel trap; sharp and powerful.

Useful english dictionary. 2012.