breech

名词 breech:

1. opening in the rear of the barrel of a gun where bullets can be loaded
   同义词：rear of barrel, rear of tube

breech

n.（名词）
The lower rear portion of the human trunk; the buttocks.
臀部：人体躯干的略靠下的后部；屁股
breeches
breeches
Trousers extending to or just below the knee.
马裤：长至膝盖或刚没膝盖的裤子
Informal Trousers.
【非正式用语】 裤子
The part of a firearm behind the barrel.
炮尾：武器的枪炮炮管后面的部分
The lower part of a pulley block.
滑车组较低的一部分

来源：
Middle English brech
中古英语 brech
from Old English brôc [pl. of] brôc [leg covering] ; akin to Gaulish br3ca [hose, trousers]
源自 古英语 brôc [] brôc的复数 [腿的覆盖物] ；类似于 高卢语 br3ca [短裤，长裤]