crash helmet
US /ˈkræʃ ˌhel.mɪt/
UK /ˈkræʃ ˌhel.mɪt/
1.
a hard hat worn by motorcyclists, racing drivers, etc., to protect the head in the event of a crash
:
•
Always wear a crash helmet when riding a motorcycle.
•
The cyclist's life was saved by his sturdy crash helmet.