knocker

Noun

• a device (usually metal and ornamental) attached by a hinge to a door

• either of two soft fleshy milk-secreting glandular organs on the chest of a woman

• one who disparages or belittles the worth of something

• a person who knocks (as seeking to gain admittance)
  • open the door and see who the knocker is
    

• (Yiddish) a big shot who knows it and acts that way; a boastful immoderate person

Related words

• Synonyms: 
  doorknocker , rapper , breast , bosom , boob , tit , titty , detractor , disparager , depreciator