noun
a hard or padded protective hat, various types of which are worn by soldiers, police officers, firefighters, motorcyclists, athletes, and others to protect the head from injury.
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The construction worker always wears a helmet for safety on the job site.
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Hey, don't forget to grab your helmet before we go biking!
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I feel like a total dork wearing this helmet, but safety first, right?
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She put on her emotional helmet before diving into the difficult conversation.