warn
🇺🇸
/wɔːrn/
🇬🇧
/wɔːn/
to tell someone about danger or a bad thing that might happen
I warn you to be careful with that hot pan.
to strongly tell someone what to do or not do to stay safe
She will warn him not to touch the broken glass.
to give an official warning after someone breaks a rule
The teacher had to warn the student for talking in class.