English Reference
noun · verb

caution

n. · v.
US /ˈkɑʃən/ UK /kˈɔːʃən/ cau·tion UK spelling cautions

  1. 01 B2 Upper Intermediate

    n.care taken to avoid danger, risk, or mistakes.

    n.the quality of being careful to avoid potential hazards or errors; prudence.

    Simple

    You should proceed with caution when driving on these icy roads.

    In context

    The investigators exercised extreme caution when entering the unstable building, fearing that any sudden movement might trigger a collapse.

  2. 02 C1 Advanced British EnglishFormal Law

    n.a formal warning given by the police to someone who has committed a minor crime.

    n.a formal warning issued by law enforcement as an alternative to prosecution for minor offences.

    Simple

    Since it was his first offence, the teenager received a police caution instead of going to court.

    In context

    The officer decided that a formal caution was a more appropriate response than a full prosecution given the suspect's clean record and cooperation.

    Usage

    Often used with the verbs 'issue' or 'receive'.

  3. 03 B2 Upper Intermediate Sport

    n.a yellow card given to a player for breaking the rules.

    n.a formal disciplinary warning, typically represented by a yellow card, issued to a player during a match.

    Simple

    The defender received a caution for a late tackle in the second half.

    In context

    After a series of persistent fouls, the referee finally issued a caution to the midfielder to regain control of the game.

    yellow cardbooking
  4. 04 B2 Upper Intermediate

    v.to warn someone about a possible problem or danger.

    v.to advise or warn someone to be careful or to take necessary precautions.

    Simple

    Doctors caution that the new medicine may cause some sleepiness.

    In context

    Financial advisors caution investors against putting all their capital into a single volatile market sector.

    Usage

    Often followed by 'against' or a 'that' clause.

  5. 05 C1 Advanced British EnglishFormal Law

    v.to give someone a formal police warning.

    v.to issue a formal warning to a suspect, often including a statement of their legal rights.

    Simple

    The police cautioned the man for shoplifting and released him.

    In context

    The detective cautioned the suspect, reminding him that anything he said could be used as evidence in a future trial.

Nolan isn’t one to [say]: ‘Oh, I’m going to throw caution to the wind and I’m going to stay here with this girl that I just met,’” Wells-Wonsley told a packed audience.

The Guardian· 14 Aug 2026

He cautions that photographers should be wary of prolonged exposure to the Sun's UV rays.

BBC News· 13 Aug 2026

Recorded since 1297 as Middle English caucioun (“bail, guarantee, pledge”), from Old French caution (“security, surety”), itself from Latin cautiō, from cautus, past participle of caveō, cavēre (“be on one's guard”).

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Origin Latin cautiō
Level C1 · Advanced
Frequency Frequent
Updated