noun
a helmet made of hard material such as plastic or metal
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Workers on the construction site are required to wear a hard hat at all times for safety.
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Hey, don't forget to grab your hard hat before heading to the job site.
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Make sure you have your lid on tight, that hard hat is a lifesaver.
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In the fast-paced world of business, wearing a hard hat symbolizes being prepared for any challenges that may come your way.