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warn

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warn/ˈwoɚn/verb
warnswarnedwarning
warn
/ˈwoɚn/
verb
warnswarnedwarning
Learner's definition of WARN  
: to tell (someone) about possible danger or trouble
[+ object]
[no object]
— usually + about or of
: to tell (someone) to do or not to do something in order to avoid danger or trouble
[+ object]
[no object]
— usually + against

warn off

[phrasal verb]
warn (someone) off or warn (someone) off (something) 
: to tell (someone) to go or stay away in order to avoid danger or trouble
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