Knock (verb)

  1. To strike a surface with a sharp sound.
  2. To make a loud noise by striking something.
  3. To criticize or express disbelief about something or someone.

Origin:

Middle english: of imitative origin.

Examples:

  1. He knocked on the door.
  2. The wind knocked over the trash cans.
  3. I knocked on the table to get everyone's attention.
  4. She knocked on the window to get his attention.
  5. He knocked his opponent's performance during the debate.
Some random words: methane, bouncer, charlatan