1. knocker - Noun
2. Knocker - Proper noun
One who, or that which, knocks; specifically, an instrument, or kind of hammer, fastened to a door, to be used in seeking for admittance.
Source: Webster's dictionaryWhen a man understands the art of seeing, he can trace the spirit of an age and the features of a king even in the knocker on a door. Victor Hugo
Even a tin knocker will shine on a dirty floor. Irish Proverb
open the door and see who the knocker is Source: Internet
One black-wainscoted room with only 10 or so tables (40 guests max) and an old fashioned ring door knocker were an auspicious start. Source: Internet
He banged the knocker on the door hard and bellowed a warning as he proceeded along the corridor. Source: Internet
Some, like Mr Knocker, buy homes and run the business themselves while others invest in development properties like Vipingo Ridge in Kilifi. Source: Internet