B1verb1K

Warn

UK /["/wɔːn/","/wɔːnz/","/wɔːnd/","/ˈwɔːnɪŋ/"]/US /["/wɔːrn/","/wɔːrnz/","/wɔːrnd/","/ˈwɔːrnɪŋ/"]/

Definition

to tell somebody about something, especially something dangerous or unpleasant that is likely to happen, so that they can avoid it

In simple words: To tell someone about something dangerous or bad that might happen.

Examples

  • I need to warn you about the upcoming storm.
  • The teacher decided to warn the students before the test.
  • He was warned several times to stop making noise.
  • The sign will warn drivers of the slippery road ahead.
  • You should warn her if you see her doing something dangerous.

Usage notes

Use 'warn' when you need to alert someone about potential danger or problems. It's appropriate in many contexts, but less suitable in casual conversations where simpler phrases might work better.

Grammar pattern

warn + object (someone) + about + object (something)

Memory hint

Sounds like 'warn' as in a 'warning sign' ahead.

Collocations

  • clearly
  • explicitly
  • bluntly
  • had better
  • have to
  • must
  • about
  • against
  • of
  • be warned
  • clearly
  • explicitly
  • bluntly
  • had better
  • have to
  • must
  • about
  • against
  • of
  • be warned

Synonyms

  • advise

Antonyms

  • encourage
  • ignore
  • dismiss

Common mistakes

  • Confused with 'advice' and use 'warn' incorrectly.
  • Using 'warn' with an incorrect preposition.
  • Omitting the object when using 'warn'.