Etymology
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fire-eater (n.)

1670s, "juggler who appears to swallow fire as part of an act," from fire (n.) + eater. From 1804 as "person of irascible or recklessly defiant disposition;" especially in U.S. history in reference to vehement Southern partizans (1851). Perhaps due to the extended senses, fire-swallower began to be used for the original sense by 1883. Related: Fire-eating.

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Definitions of fire-eater

fire-eater (n.)
a member of a fire department who tries to extinguish fires;
Synonyms: fireman / firefighter / fire fighter
fire-eater (n.)
a belligerent grouch;
Synonyms: hothead
fire-eater (n.)
a performer who pretends to swallow fire;
Synonyms: fire-swallower
From wordnet.princeton.edu