crutch

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. a wooden or metal staff that fits under the armpit and reaches to the ground;
used by disabled person while walking (Freq. 2)
• Hypernyms:
staff
2. anything that serves as an expedient (Freq. 1)
- he uses drugs as a psychological crutch
• Hypernyms:
expedient