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To warn someone about or against something

warn

verb

to make someone conscious of a possible problem or danger so that they will not be hurt

alert

verb

to tell someone in authority about a danger or problem so that they can take action to deal with it

tip off

to give someone a warning or secret information about something

caution

verb

to tell someone about a danger or problem that they need to know about or avoid. In ordinary speech, it is more usual to say that you warn someone

raise/sound the alarm

to tell people about something dangerous that is happening

warn off

to tell someone that they must stop doing something and that if they do not something bad will happen to them

whistle

verb

to blow a whistle as a warning or to get someone’s attention

forewarn

verb

to warn someone about a problem or dangerous situation that is likely to happen

warn

verb

to tell someone that they will be punished or that something bad will happen if they do something

lecture

verb

to talk to someone seriously in order to criticize them or warn them about something, especially when this is annoying

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