steel trap

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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