A thresher shark (Alopias spp.).
Any of several large pelagic sharks of the genus Alopias, which have a very long tail; more commonly called thresher sharks.
Anything or anyone that threshes.
A now-obsolete hand tool for threshing, also called a flail.
A modern farm machine for threshing grain, now a part of combine harvesters rather than a separate implement.