1a person or machine that separates grain from corn or other crops by beating.
2 (also thresher shark) a surface-living shark with a long upper lobe to the tail. Threshers often hunt in pairs, lashing the water with their tails to herd fish into a tightly packed shoal.
Alopias vulpinus, family Alopidae
thresher in other Oxford dictionaries
Definition of thresher in the US English dictionary
