B1 to make someone realize a possible danger or problem, especially one in the future警告;告诫;提醒
More examples
I have to warn you that there's a degree of danger involved in this.
My sister warned me not to trust him.
I'm warning you, don't mess about with those tools.
The leaflet warns children about the dangers of smoking.
My mother always warned me not to talk to strangers.
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