noun

• (agriculture) Anything or anyone that threshes.
• (agriculture, historical) A now-obsolete hand tool for threshing, also called a flail.
• (agriculture) A modern farm machine for threshing grain, now a part of combine harvesters rather than a separate implement.
• A surname.
• (zoology) Short for thresher shark. [Any of the species of sharks in the genus Alopias, three of which are extant.]