1. 谨慎;慎重
    Caution is great care which you take in order to avoid possible danger.

    e.g. Extreme caution should be exercised when buying part-worn tyres...
           购买部分磨损轮胎时要格外当心。
    e.g. The Chancellor is a man of caution.
           财政大臣为人处世谨慎。

2. 提醒;告诫;警告
    If someone cautions you, they warn you about problems or danger.

    e.g. Tony cautioned against misrepresenting the situation...
           托尼告诫说不要歪曲形势。
    e.g. The statement clearly was intended to caution Seoul against attempting to block the council's action again...
           显然，这个声明的目的是要警告首尔不要尝试再次阻拦委员会的行动。

3. 受到(警方)正式警告
    If someone who has broken the law is cautioned by the police, they are warned that if they break the law again official action will be taken against them.

caution

    e.g. The two men were cautioned but police say they will not be charged...
           那两个人受到了警告，不过警方说不会对他们提出指控。
    e.g. Tapp was eventually cautioned for wasting police time.
           最后，塔普因浪费警方时间而受到警告。

4. 向…告知其法律权利(即嫌疑人所说的任何话都可能成为呈堂证据)
    If someone who has been arrested is cautioned, the police warn them that anything they say may be used as evidence in a trial.

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    e.g. Nobody was cautioned after arrest.
           被捕后，没有人被告知其法律权利。

5. 把理智抛至脑后;鲁莽行事;恣意妄为
    If you throw caution to the wind, you behave in a way that is not considered sensible or careful.

    e.g. I threw caution to the wind and rode as fast as I could.
           我不顾一切，骑得飞快。

6. to err on the side of caution -> see err