knock

Compared meaning: hit or strike something (slap = noun here).

比较义项：击打、敲打（knock、strike、beat 为动词，slap 在此为名词，指拍打的动作）。

• knock 本词

  Knock means to hit a surface firmly, usually to get attention, as with a fist on a door; it does not imply great force or repeated impact like beat, or hitting a person like strike or slap.

  knock 指用力敲击某个表面（如用拳头敲门）以引起注意，力度不大，也不像 beat 那样反复击打，也不像 strike 或 slap 那样打人。

  Someone knocked on the door while we were eating dinner.

  我们吃晚饭时，有人敲了敲门。

• strike

  Strike stresses a single, sudden, forceful blow, often to a person, object or weapon; it sounds more formal or dramatic than knock, and unlike beat, it does not suggest repeated hits.

  strike 强调突然而有力的一击，常用于打人、物体或武器，语气比 knock 更正式、更有力，且不像 beat 那样表示反复击打。

  The boxer struck his opponent with a powerful right hook.

  那位拳击手用一记有力的右勾拳击中了对手。

• beat

  Beat highlights repeated hitting over time, as in beating a drum or beating someone violently; it implies more than one impact, unlike the single blows of strike, knock or slap.

  beat 强调持续、反复的击打，比如敲鼓或反复殴打某人，暗示不止一次的击打，不同于 strike、knock 或 slap 的单次一击。

  He beat the drum steadily throughout the whole song.

  他在整首歌里稳稳地反复敲鼓。

• slap

  Slap is a noun for one quick hit given with the open hand, usually to a person's face or a small target; unlike the verbs knock, strike and beat, it names the act itself rather than a manner of hitting.

  slap 是名词，指用张开的手掌快速拍打一下，通常打在人的脸上或较小的目标上；与动词 knock、strike、beat 不同，它表示这一具体的拍打动作，而不是某种打的方式。

  He gave the mosquito a quick slap before it could bite him.

  在蚊子咬他之前，他很快地拍了它一下。

Knock, strike, beat, and slap all relate to hitting, but the manner differs. Knock means hitting a surface to get attention. Strike means a single, sudden, forceful blow. Beat means hitting repeatedly, as in beating a drum. Slap is a noun for one open-hand hit.

这四个词都可表示打或击，但方式和语气不同：knock 侧重敲击表面以引起注意，strike 侧重突然而有力的一击，beat 侧重反复击打，slap 则是名词，指用手掌快速拍打一下的动作。这里不比较 strike 的罢工义、beat 的打败对手或心跳义、knock 的口语批评义，以及 slap 作动词拍打的用法。

Compared meaning: to say someone or something is bad (verb).

比较义项：抨击，批评（动词）。

• knock 本词

  Informal and often spoken, can sound dismissive or flippant; commonly used about things like plans, films, or products rather than formal criticism of people.

  较为口语化，常带随口、略显轻蔑的语气；常用来评论计划、电影、产品等事物，而不是对人进行正式批评。

  Reviewers knocked the new phone for its short battery life.

  评论者们吐槽这款新手机续航时间太短。

• criticize

  Neutral, general-purpose word for saying someone or something is wrong or bad; fits both formal and informal contexts, of people, work, or decisions.

  语气中性，是表达“某人或某事不好”的通用词，正式和非正式场合都适用，可用于评价人、工作或决定。

  Try not to criticize her work in front of the whole team.

  尽量不要当着全组的面批评她的工作。

Knock and criticize both mean to say someone or something is bad. Knock is informal and can sound dismissive, often about things like plans. Criticize is more neutral, used in formal and informal contexts. This does not compare knock's meaning of hitting a door.

这两个词在“说某人或某事不好”这个意义上相近，但语气不同：knock 更口语化，带有随口贬低的意味，常用于评论事物；criticize 语气更中性，正式和非正式场合都适用。这里不比较 knock 的“敲（门）”这一动作义。

Compared meaning: the sound of knocking on a door (noun).

比较义项：敲击、敲门声（名词）。

• knock 本词

  General, neutral word for a firm knocking sound; covers taps of any force or speed, from light to loud, in ordinary everyday contexts.

  泛指有力的敲击声，力度可轻可重，节奏可快可慢，是日常各种场合都适用的中性说法。

  There was a loud knock at the door just as we sat down to eat.

  我们刚坐下吃饭，门上就传来一声响亮的敲击声。

• rap

  Describes a quick, light, sharp knocking sound, usually made with the knuckles; suggests a brisk, crisp tap rather than a heavy or sustained knock.

  指用指关节发出的又快又轻、清脆的敲击声，强调短促利落，而非沉重或持续的敲击。

  She heard a quick rap on the window and looked up.

  她听到窗户上传来一声又快又轻的敲击声，抬起头看了看。

Knock and rap both mean the sound of hitting a door. Rap is a quick, light, sharp knock, usually with the knuckles. Knock is a general, neutral word for a firm knock, of any force. Not compared: rap as music, or knock as criticize.

knock 和 rap 都指敲门或敲物发出的声音，但 rap 特指又快又轻、清脆短促的敲击，knock 则是泛指有力敲击声的中性说法，力度和节奏都不限定。这里不比较 rap 作为“说唱（音乐）”或“拍打（手掌）”的意思，也不比较 knock 作为“批评，指责”的非正式用法。