Related topics: Household
knock·er /ˈnɒkə $ ˈnɑːkər/ noun [countableC] 1.
DHa piece of metal on an outside door of a house that you hit against the door to attract the attention of the people inside 门环 → doorknocker 2. knockers [plural] spoken not politeHBH an offensive word meaning a woman’s breasts 〔女人的一对〕乳房,奶子