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English definition of “warn”

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warn

verb [I/T]  /wɔrn/ us  
to make someone aware of a possible danger 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 lock our cars in the parking lot. [I] The radio warned all day of the bad weather coming.
(Definition of warn from the Cambridge Academic Content Dictionary © Cambridge University Press)
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