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to warn
01
to tell someone in advance about a possible danger, problem, or unfavorable situation
02
advise or counsel in terms of someone's behavior
03
to inform or alert someone about something before it happens
Example
The lifeguard warned the swimmers about the dangerous rip currents.
The detective warned the witness about the possible threats to their safety.
The software system warned users about potential security risks.
The weather forecast warned residents of an approaching storm.
The fluorescent yellow signs warned drivers of the construction ahead.