名詞 knocker:

1. (Yiddish) a big shot who knows it and acts that way; a boastful immoderate person
2. a person who knocks (as seeking to gain admittance)
3. one who disparages or belittles the worth of something
   同義詞：detractor, disparager, depreciator
4. either of two soft fleshy milk-secreting glandular organs on the chest of a woman
   同義詞：breast, bosom, boob, tit, titty
5. a device (usually metal and ornamental) attached by a hinge to a door
   同義詞：doorknocker, rapper

1. At the rat-a-tat of the knocker her heart fly into her mouth.
   聽到敲擊者咚咚聲她的心都懸起來了。
2. One that raps or strikes, especially a door knocker.
   敲擊者敲擊或打擊的人，尤指敲門者

knock.er

n.（名詞）
A hinged fixture, such as a metal ring or bar, used for knocking on a door.
門環(huán)：供敲門用的有鉸鏈的固定物，比如金屬環(huán)或桿
Vulgar Slang A woman`s breast.
【粗俗用語】 【俚語】 女人的乳房
A goblin or dwarf said to live under the earth and direct miners to ore by knocking.
指礦怪：傳說中一種生活在地下的妖怪或矮人，用敲擊聲向礦工指明礦藏所在地