Also, thrasher. Also called thresher shark. a large shark of the genus Alopias, especially A. vulpinus, which threshes the water with its long tail to drive together the small fish on which it feeds.
a person who threshes
short for threshing machine
Also called thrasher, thresher shark. any of various large sharks of the genus Alopias, esp A. vulpinus, occurring in tropical and temperate seas: family Alopiidae. They have a very long whiplike tail with which they are thought to round up the small fish on which they feed