large swift fly the female of which sucks blood of various animals
同义词：clegclegghorse fly
英汉双解大词典
horsefly/ˈhɔːsˌflaɪ/
1.
N（名词）
any large stout-bodied dipterous fly of the family Tabanidae, the females of which suck the blood of mammals, esp horses, cattle, and man 虻科 (Also called gadfly, cleg)