knock.er
n.(名词)A hinged fixture, such as a metal ring or bar, used for knocking on a door.门环:供敲门用的有铰链的固定物,比如金属环或杆Vulgar Slang A woman`s breast.【粗俗用语】 【俚语】 女人的乳房A goblin or dwarf said to live under the earth and direct miners to ore by knocking.指矿怪:传说中一种生活在地下的妖怪或矮人,用敲击声向矿工指明矿藏所在地