cheekpiece

cheekpiece
noun
  1. a part of an object which covers or rests on the cheek, in particular
    物体上罩住或贴着脸颊的部分,尤指
    a smooth block fitted to the stock of a rifle or shotgun and resting against the face when aiming from the shoulder .
    瞄准时枪托上贴脸的平滑部分。
    ■either of the two straps of a horse's bridle joining the bit and the headpiece
    (连接嚼子和笼头的)马勒带
    ■a bar on a horse's bit which lies outside the mouth
    马嚼子上位于嘴外的勒条
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