knock

• 指敲击（通常用指关节或硬物）表面（如门）时发出的短促、清晰的声音；也指敲击的动作或一击。

A noun referring to a sharp, audible sound made by striking a surface, typically a door, with the knuckles or a hard object.

1. Sound of hittingA2formal

   A sharp, repeated sound made by hitting a surface, especially a door.

   敲击声

   • I heard a knock at the door.
   • There was a loud knock on the window.
   • She gave three quick knocks before entering.

   同义词bangraptapthudthump

2. Criticism or setbackB2informal

   An instance of criticizing someone or something, or a setback.

   批评或挫折

   • He took a knock after losing the competition.
   • The review was a knock on the restaurant's service.
   • She received a knock for her careless mistake.

   同义词blowcriticismdisappointmentrebuffreversalsetback

• 表示用手或硬物敲击或撞击表面，常为了引起注意或移动物体。

A verb used to indicate the act of striking a surface with a sharp blow, typically to attract attention or cause something to move.

1. Strike a surfaceA1formal

   To hit a surface with a sharp blow, typically to attract attention or signal entry.

   敲击

   • She knocked on the door before entering.
   • He knocked loudly on the window to get her attention.
   • The child knocked the glass off the table by accident.

   同义词bangbeathammerhitpoundrapstriketapthump

2. Criticize or disparageB2informal

   To criticize someone or something, often unfairly or persistently.

   批评

   • Stop knocking his efforts; he's doing his best.
   • The critics knocked the movie for its weak plot.
   • She always knocks the local restaurants without trying them.

   同义词badmouthbelittlecriticizedenigratedeprecatedisparagemalignput downrun down

   反义词commendcomplimentlaudpraise

3. Make a noiseA2informal

   To produce a sound by hitting something, often as a signal.

   敲

   • The engine started knocking after the long drive.
   • I heard a knocking sound coming from the basement.
   • The pipes knock when the water is turned on.

   同义词bangclunkhammerpoundraptapthump

短语动词变体knock againstknock downknock offknock outknock overknock up