truncheon
noun(also baton)
(both especially British English) (North American English nightstick)
a short thick stick that police officers carry as a weapon 警棍 Some of the prisoners were beaten about the head with rubber truncheons. 一些囚犯头部遭到橡皮警棍的击打。
Word OriginMiddle English (denoting a piece broken off (especially from a spear), also a cudgel): from Old French tronchon ‘stump’, based on Latin truncus ‘trunk’.