Definition

to knock (on, at a door): to bang, to tap (at the door, so that somebody will let you in) verb
to hear a knock at the door: to hear a noise, a bang at the door idiom
"knock knock": onomatopoeia that imitates the sound of knocking at the door; a type of joke (that usually finishes with a play on words) idiom
-Knock Knock! -Who’s there? -Ken. -Ken who? -Ken I come in? It's freezing out here!

UK: I thought someone was knocking at the door, but there was nobody there.
US: I will knock on your door at 9AM to wake you up.
  • "Knock knock Luna : Woody!"
  • "(knock knock)"
  • "Brian : Knock knock!"
  • "Jean knocks on Philip's door"
  • "knock on your door out of the blue saying that they notice that your roof / driveway / windows / walls need urgent work."
  • "Knock knock Luna : Ah, come in!"
  • "Knock knock Luna : Hello Woody, come on in!"
  • "Knock knock Hannah : Come in!"
  • "Now, use the secret knock."
  • "This is where many of our most powerful fragrances come from. Knock knock, Horatio?"

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