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Từ điển WordNet v3.1 - WordNet Dictionary
fifth wheel
1. someone or something that is unwanted and unneeded
• Syn:
deadwood
• Hypernyms:
redundancy, redundance
2. an extra car wheel and tire for a four-wheel vehicle
• Syn:
spare
• Hypernyms:
car wheel
3. a steering bearing that enables the front axle of a horse-drawn wagon to rotate
• Hypernyms:
bearing
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