thresher
 打穀者,打穀機,長尾鯊
 Thrash·er Thresh·er, n.
 1. One who, or that which, thrashes grain; a thrashing machine.
 2. Zool. A large and voracious shark (Alopias vulpes), remarkable for the great length of the upper lobe of its tail, with which it beats, or thrashes, its prey. It is found both upon the American and the European coasts. Called also fox shark, sea ape, sea fox, slasher, swingle-tail, and thrasher shark.
 3. Zool. A name given to the brown thrush and other allied species. See Brown thrush.
 Sage thrasher. Zool. See under Sage.
 Thrasher whale Zool., the common killer of the Atlantic.
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 Thresh·er n. Same as Thrasher.
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 thresher
      n 1: a farm machine for separating seeds or grain from the husks
           and straw [syn: thrasher, threshing machine]
      2: large pelagic shark of warm seas with a whiplike tail used
         to round up small fish on which to feed [syn: thrasher,
         thresher shark, fox shark, Alopius vulpinus]