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Meaning of “warn” in the English Dictionary

"warn" in British English

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warnverb [I or T]

uk   /wɔːn/  us   /wɔːrn/
B1 to make someone ​realize a ​possibledanger or ​problem, ​especially one in the ​future: [+ obj + to infinitive ] We were warned not toeat the ​fish which might ​upsetourstomachs. [+ obj + (that) ] Have you warned them (that) there will be an ​extraperson for ​dinner? I was warned against/off going to the ​eastcoast because it was so ​full of ​tourists. The ​boatingarea is ​marked with ​buoys to warn offswimmers. There were ​signs warning offog as ​soon as we got onto the ​motorway. This ​particularcurry is ​extremelyhot - be warned! Put that ​ball down now, Laura - I'm warning you (= I will ​punish you if you do not)!

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(Definition of warn from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)

"warn" in American English

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warnverb [I/T]

 us   /wɔrn/
to make someone ​aware of a ​possibledanger or ​problem so that it can be ​avoided: [T] I warned her not to ​waste her ​money on that ​movie. [T] We’d been warned that we should ​lockourcars in the ​parking lot. [I] The ​radio warned all ​day of the ​badweather coming.
(Definition of warn from the Cambridge Academic Content Dictionary © Cambridge University Press)
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