柯林斯詞典knocker /?n?k?/ (knockers) 1. N-COUNT A knocker is a piece of metal on the front door of a building, which you use to hit the door in order to attract the attention of the people inside. 門環(huán)→see also knock 返回 knocker劍橋詞典 knocker noun [C] (METAL OBJECT) (also doorknocker) a metal object attached to a door that visitors use to hit the door in order to attract attention （裝在門上供人敲門用的）門環(huán) knocker noun [C] (CRITIC) UK informal disapproving a person who is always criticizing someone or something 吹毛求疵的人，一味批評(píng)的人 knocker noun [C] (BREASTS) ?knockers [ 名詞的複數(shù)形式 ] slang a woman's breasts . Some people consider this word offensive . （冒犯性用語(yǔ)）乳房，嬭子 返回 knocker