helmetnoun [ C ]uk /ˈhel.mət/ us /ˈhel.mət/
- It's very risky to ride your bike without wearing a cycle helmet.
- To keep the helmet in position, fasten the strap beneath the chin.
- Is the strap on this helmet adjustable?
- He pulled on his helmet and straddled the motorbike.
- You cannot come onto the building site unless you're wearing a helmet.
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