knockern.

英 'nɒkə | 美 'nɑkɚ

中文n. 门环；敲击者；吹毛求疵的人

词根词源

knocker (n.)late 14c., agent noun from knock. Sense of "door banger" is by 1590s. Knockers "a woman\\'s breasts" is slang attested from 1941.

关键词

knocker