Meaning

noun a farm machine for separating seeds or grain from the husks and straw

noun large pelagic shark of warm seas with a whiplike tail used to round up small fish on which to feed

originEtymology tree Proto-Indo-European *terh₁-der.? Proto-Germanic *þreskaną Old English þrescan Middle English threschen Middle English -er Middle English thresshere English thresher From Middle English thresshere; equivalent to thresh + -er. The shark's tail is thought to resemble the implement.

Etymology from Wiktionary, CC BY-SA 3.0