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Webster 1828 Edition

Noun.

One who thrashes grain.

thrasher ‎(plural thrashers)

One who thrashes.
Any of several New World passerine songbirds, of the genera Toxostoma, Allenia, Margarops, Oreoscoptes and Ramphocinclus in the family Mimidae, that have a long, downward-curved beak.
A thresher shark.
(informal) A fan of thrash metal music.

one who thrashes

bird of family Mimidae