| 单词 | breech | 
| 释义 | breech   (brēch) n. 1.  The lower rear portion of the human trunk; the buttocks. 2.  a.  A breech presentation or delivery. b.  A fetus in breech presentation. 3.   breeches a.  Knee breeches. b.  Informal   Pants. c.  Tight-fitting pants for horseback riding, often including a wide layer of coarse material such as leather centered along the inseam to provide improved grip. 4.  The part of a firearm behind the barrel. 5.  The lower part of a pulley block. [Middle English brech, from Old English brēc, pl. of brōc, leg covering, Gaulish brāca, hose, trousers.] | 
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