tin hat

noun

, Slang.

1. a steel helmet worn by soldiers.

tin hat

noun

1. obsolete.
   a steel helmet worn by military personnel for protection against small metal fragments

Word History and Origins

Origin of tin hat¹

First recorded in 1915–20

Example Sentences

It's time to put on the tin hats and ignore the noise.

From BBC

Magnuson said one colleague had a puppet with bright red hair, just like Magnuson, wearing a tin hat with a Freedom Caucus sticker.

From Seattle Times

“He must have gone down to Mar-a-Lago with Trump wearing their tin hats, I mean — what a conspiracy theory,” McAuliffe said.

From Washington Post

Written in the present tense, in short bursts, the text appears like chopped-up radio transmissions, dispatched from someone squirrelly wearing a tin hat and raised binoculars.

From Seattle Times

The spectators have put on their tin hats.

From The Guardian