hard hat

Từ điển WordNet v3.1 - WordNet Dictionary

noun

1. a worker skilled in building offices or dwellings etc.
• Syn:
construction worker
• Hypernyms:
craftsman, artisan, journeyman, artificer
2. a lightweight protective helmet (plastic or metal) worn by construction workers
• Syn:
tin hat, safety hat
• Hypernyms:
helmet