knock on

• Bater na superfície de algo (como uma porta) com os nós dos dedos para chamar a atenção ou pedir permissão para entrar; também usado em sentido figurado para indicar aproximação de uma situação ou oportunidade.

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.

   Bater

   • 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

   • 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.