n.

1. 小心，谨慎[U]
   Dad always drives with caution.

   爸爸开车一直十分小心。

2. 警告，告诫[C]
   The policeman let the driver off with a caution.

   警察向司机提出警告后就让他走了。

3. 【口】令人发笑的人或物；发噱的事[S]

vt.

1. 警告，告诫，使小心[（+about/against/for）]
   We were cautioned not to make a lot of noise after ten in the evening.

   我们被告诫晚上十点以后不要大声喧闹。

   The policeman cautioned me for parking here.

   警察警告我不可在此停车。

n.

1. care taken to avoid danger or mistakes.
2. Brit. an official or legal warning given to someone who has committed a minor offence but has not been charged.
3. informal, dated an amusing or surprising person.

v.

1. say something as a warning.
   ▸ (caution against) warn or advise against.
2. Brit. issue an official or legal warning to.
   ▸(of a police officer) advise (someone) of their legal rights when arresting them.