knock on

• Golpear suavemente una superficie, como una puerta, con los nudillos para llamar la atención o pedir permiso para entrar; también se usa en sentido figurado para referirse a acercarse a una situación o a que algo está por llegar.

To strike a surface (such as a door) with the knuckles to gain attention or request entry; also used figuratively to mean approaching a situation or opportunity.

1. Strike a surfaceA1formal

   To hit a surface, typically a door, with the knuckles to gain attention or request entry.

   golpear (una superficie)

   • Please knock on the door before entering.
   • He knocked on the window to get her attention.
   • She knocked on the table to signal the start of the meeting.

2. Criticize or find faultB2informal

   To express negative opinions or criticism about someone or something.

   criticar, menospreciar

   • Stop knocking on his efforts; he's trying his best.
   • Critics are always knocking on the new policy.
   • She tends to knock on everything she doesn't understand.