Dictionary

hard hat

noun \usually -ˈhat for 1 and -ˌhat for 1b & 2\

: a hat that is worn by workers at a building site to protect their heads from falling objects

Full Definition of HARD HAT

1
a :  a protective hat made of rigid material (as metal or fiberglass) and worn especially by construction workers
b :  a construction worker
2
:  a conservative who is intolerant of opposing views

First Known Use of HARD HAT

1926

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