He hit a monkey with a blow-dart during his jungle expedition.

blow-dart 是由 blow（吹）和 dart（飞镖、标枪）组成的复合词。blow 指用嘴吹气，dart 指细小的投射物。 blow-dart 指"吹箭"，是一种原始武器，通过吹气将细小的飞镖发射出去。