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warn

B1
Common

Pronunciation

UK

  • /wˈɔːn/

US

  • /ˈwɔrn/

Meanings

Verb

  1. to tell someone about possible danger or trouble so they can avoid it

  2. to firmly tell someone not to do something or to expect consequences

Beyond the definition

To warn someone is to tell them about a possible problem or danger so they have time to prepare or stay away from it. A lifeguard may warn swimmers about rough waves, and a mechanic may warn you that your brakes are failing. The message can be spoken, written, or shown by a sign or signal. Sometimes it is gentle, and sometimes it is urgent, depending on how serious the danger is. A good friend may warn you about a bad idea, and a weather report may warn us about an approaching storm.

Examples

  1. 1

    Medical advice

    The doctor warned me not to start training again too soon.

  2. 2

    Storm safety

    Officials warned residents to stay indoors during the storm.

  3. 3

    Road safety

    She warned us about the icy roads before we left.

  4. 4

    Traffic delays

    Police warned drivers of long delays after the accident.

More examples
  1. 5

    Practical warning

    I should warn you that the hotel has very thin walls.

  2. 6

    Health advice

    Health experts have warned against eating too much processed meat.

    • Patternwarn against + action/choice

      say it is risky or a bad idea

  3. 7

    Land access

    The farmer put up a fence to warn people off the land.

    • Patternwarn someone off + place/thing

      tell or show them to stay away

  4. 8

    Advance notice

    Just to warn you, the meeting usually runs late.

See also

Similar

Shades of meaning

Contrast

Used with (collocations)

  • warn someone about something
  • warn against doing something
  • warn of danger

Word family

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Forms and spellings

4 forms open this card.

Main spelling

  • warnverb

Forms

  • warning-ing formverb
  • warnedpast tenseverb
  • warnsverb