definition of
knocker

[1] #1 knocker n. (Yiddish) a big shot who knows it and acts that way; a boastful immoderate person. wn

[2] #2 knocker n. a person who knocks (as seeking to gain admittance); "open the door and see who the knocker is". wn

[3] #3 knocker n. [detractor, disparager, depreciator] one who disparages or belittles the worth of something. wn

[4] #4 knocker n. [breast, bosom, boob, tit, titty] either of two soft fleshy milk-secreting glandular organs on the chest of a woman. wn

[5] #5 knocker n. [doorknocker, rapper] a device (usually metal and ornamental) attached by a hinge to a door. wn