knocker

1 ENTRIES FOUND:
knocker /ˈnɑːkɚ/ noun
plural knockers
knocker
/ˈnɑːkɚ/
noun
plural knockers
Britannica Dictionary definition of KNOCKER
1 
[count] : a small metal device on a door that you move in order to make a knocking sound
2 
knockers [plural] informal + sometimes offensive : a woman's breasts