knocker

1 3.4

A person who knocks on a door to be let in

: persona que llama a la puerta

She was still regarding the knocker when a girl about eight years old opened the door and admitted her.

A online marketing department and a offline marketing department like door knockers, people that go door to door, right?

Examples

When was the last time you saw a knocker?

Private Lessons (1981)
The knocker on the front door was old and made a distinctive sound when used.
When the door knocker sounded, I let Mama in.

Fiction book (1994)
When the knocker sounded, I almost didn't answer.

Fiction book (1999)
No bell, no knocker.

Academic text (2007)
I looked longingly at the stone walls, imagining that at the next gate, number 30 or 40 or 50, I would bang on the knocker until someone let me inside, let me sit down and rest, and let me get warm.

Academic text (2002)
On election day, it's an added bonus when door-knockers get information about who's already shown up to the polls and who hasn't; it means they can pass over the homes of people who have already voted.

Blog text (1)
A brawny slattern, with a beehive of hair dyed red and a smutched apron, answered the knocker.

Fiction book (1993)
When the knocker sounded loudly, I quickly opened the door to greet our guests.
She waited patiently for the knocker to tap before she would let anyone in.

on the knocker

9.9

Goes from person to person to ask for something

brass knocker

1 4.0

A metal handle on a front door that you lift and hit to make a knocking sound

knocker singular

knockers plural

knocker = knock (transparent) = knock + er

Agent noun from the verb 'knock' indicating 'one who knocks (on a door)'; straightforward for learners.

Knocker comes from knock ('to hit' or 'rap') and -er ('one who'), so it simply means 'a person who knocks on a door' to ask to be let in.