warn - definition and synonyms

verb [intransitive/transitive] 

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present tense
present participlewarning
past tensewarned
past participlewarned
  1. 1
    to make someone conscious of a possible problem or danger so that they will not be hurt
    warn someone to do something:

    Police are warning all women in the area to take extra care when going out alone.

    warn against:

    Recent studies warn against drinking too much caffeine.

    warn someone about something:

    Travel agents are not warning tourists about the dangers of crime in holiday resorts.

    warn of:

    Scientists warned of the threat to beaches and rivers from pollution.

    warn that:

    The report warns that consumers could end up paying higher prices.

  2. 2
    to tell someone that they will be punished or that something bad will happen if they do something

    I warned you not to go to that party last night.

phrasal verbs