Etymology
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thresher (n.)

late 14c., agent noun from thresh. The thresher shark (c. 1600) so called for its long upper "tail," which resembles a threshing tool. The Greek for it was alōpēx, literally "fox," also for the tail.

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Definitions of thresher

thresher (n.)
a farm machine for separating seeds or grain from the husks and straw;
Synonyms: thrasher / threshing machine
thresher (n.)
large pelagic shark of warm seas with a whiplike tail used to round up small fish on which to feed;
Synonyms: thrasher / thresher shark / fox shark / Alopius vulpinus
From wordnet.princeton.edu