noun Date: 14th century one that knocks: as, a metal ring, bar, or hammer hinged to a door for use in knocking, a persistently pessimistic critic, breast
KNOCKER
Meaning of KNOCKER in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012