knocker
n
1 [C] hinged metal hammer attached to a door, used for knocking by sb outside who wants the door to be opened 門環. =>illus at App 1 見附錄1插圖, page vi.
2 [C] (infml 口) person who constantly criticizes 一味批評的人; 吹毛求疵的人.
3 knockers [pl]
( Brit sl sexist 諱, 俚, 性別偏見) woman's breasts 女子的乳房
a nice pair of knockers 一對漂亮的乳房.