knocker

英文解釋：

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

例句：

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