caution sb against sth/doing sth
表示提醒某人避免做某事或远离某物。
The doctor cautioned him against smoking.
医生告诫他不要吸烟。
出示黄牌；警告；警告；提醒注意需要谨慎。；出示黄牌。；警告；[计] 警告
to warn someone about possible danger or problems
警告；提醒注意需要谨慎。
To warn; to alert, advise that caution is warranted.
出示黄牌。
To give a yellow card.
一般现在时
I caution you about the risks.
我警告你注意风险。
一般过去时
She cautioned him not to go there.
她告诫他不要去那里。
现在进行时
They are cautioning against reckless driving.
他们正在警告不要鲁莽驾驶。
The teacher cautions her students against plagiarism.
老师警告她的学生不要抄袭。
用法提示：动词caution的第三人称单数形式，表示警告某人不要做某事。
The police officer cautioned the driver about speeding.
警察警告司机不要超速。
用法提示：动词caution的过去式，表示已发生的警告行为。
The lifeguard is cautioning swimmers to stay within the designated area.
救生员正在警告游泳者留在指定区域内。
用法提示：动词caution的现在分词形式，表示正在进行的警告动作。
表示提醒某人避免做某事或远离某物。
The doctor cautioned him against smoking.
医生告诫他不要吸烟。
用不定式说明提醒某人应当做某事。
The teacher cautioned us to be careful with the chemicals.
老师告诫我们小心处理这些化学品。
that 从句引出提醒的具体内容。
The official cautioned that the road might be icy.
官员提醒说路面可能结冰。
体育比赛中表示因犯规而出示黄牌警告。
The referee cautioned the defender for a late tackle.
裁判因一次迟到的铲球警告了那名后卫。
最直接的常用词，语气中等；caution 更正式，常用于书面或正式提醒。
强调使某人注意并准备应对危险，常用于紧急情况；后常接 to。
正式用语，语气较强，常含责备之意，因对方不当行为而告诫。
强调在危险发生前给出警告，突出“预先”；不如 warn 常用。
grammar · medium
易错句子The doctor cautioned him of the side effects of the drug.
正确表达The doctor cautioned him about the side effects of the drug.
caution 不能与介词 of 搭配。汉语“警告某人某事”常用 warn sb of sth，但 caution 要用 about 或 against 引出警示内容，如 caution sb about sth / caution sb against sth。
grammar · medium
易错句子The police cautioned the drivers don't drive too fast.
正确表达The police cautioned the drivers not to drive too fast.
caution 后接不定式时，否定式是 not to do，而不是 don't do。汉语“警告某人不要做某事”若直译为 don't 会形成错误的从句式混用。
grammar · medium
易错句子The lifeguard cautioned against to swim in the deep water.
正确表达The lifeguard cautioned against swimming in the deep water.
against 是介词，后面要接动名词（doing），不能接不定式（to do）。汉语“警告不要做某事”若直译为 against to do 就错了，应改为 against doing。
针对“警告；提醒注意危险”这一义项；caution 是劝阻、警示风险，encourage 是鼓励行动，二者方向相反，不能互换。
针对“提醒注意”义项；caution 让人意识到风险，reassure 则消除担忧。不适用于“出示黄牌”的义项。
告诫不要做；对…提出警告
The doctor cautioned against overusing antibiotics.
医生告诫人们不要过度使用抗生素。
警告说；提醒说
She cautioned that the road conditions were dangerous.
她提醒说路况很危险。
提醒某人注意
The manager cautioned us about the deadline.
经理提醒我们注意截止日期。
告诫某人不要做
They cautioned him against making hasty decisions.
他们告诫他不要匆忙做决定。
提醒某人做某事
The instructor cautioned us to check our equipment.
教练提醒我们检查装备。
无前缀；词根 caut-（小心，提防）+ 后缀 -ion（名词/行为后缀，此处作动词）。同根词：cautious（谨慎的）、precaution（预防）、cautionary（警示的）。
警告他人时，常提醒注意危险。
发出警告通常是为了保障安全。
预防措施是避免风险的行动，与接受告诫相关。
告诫常旨在降低风险。
被警告后会对潜在危害更加警觉。
把谨慎抛到九霄云外；不顾一切，鲁莽行事
She decided to throw caution to the wind and quit her job to travel the world.
她决定不顾一切，辞掉工作去环游世界。
宁可过于谨慎也不冒险；稳扎稳打
When driving in fog, it's better to err on the side of caution.
雾天开车时，宁可过于谨慎也不冒险。
Choose the next layer that will help you use caution with more confidence.
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Dictionary facts from ECDICT, WIKTIONARY, WORDNET.