1. [ noun ] (anatomy,zoology,sexuality) either of two soft fleshy milk-secreting glandular organs on the chest of a woman
Synonyms: tit breast titty boob bosom
Related terms: mammary_gland adult_female_body lactiferous_duct areola
2. [ noun ] one who disparages or belittles the worth of something
Synonyms: detractor depreciator disparager
Related terms: cynic defamer hatemonger muckraker deprecate
3. [ noun ] a person who knocks (as seeking to gain admittance)

"open the door and see who the knocker is"

Related terms: person knock
4. [ noun ] (Yiddish) a big shot who knows it and acts that way; a boastful immoderate person
Related terms: big_shot Yiddish
5. [ noun ] a device (usually metal and ornamental) attached by a hinge to a door
Synonyms: rapper doorknocker
Related terms: device front_door
Similar spelling:   knacker