tin hat
noun Slang.
a steel helmet worn by soldiers.
Origin of tin hat
First recorded in 1915–20
Words nearby tin hat
tin cup,
tin difluoride,
tin ear,
tin fish,
tin god,
tin hat,
tin lizzie,
tin pan alley,
tin pants,
tin parachute,
tin pest
British Dictionary definitions for tin hat
tin hat
noun
obsolete, informal
a steel helmet worn by military personnel for protection against small metal fragments