Synonyms of tip someone off
tip someone off
▷ See tip
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adviseIf you advise someone of a fact or situation, you tell them the fact or explain what the situation is.
• I must advise you of my decision to retire.
alertIf you alert someone to a situation, especially a dangerous or unpleasant situation, you tell them about it.
• I was hoping he'd alert the police.
warnIf you warn someone about something such as a possible danger or problem, you tell them about it so that they are aware of it.
• They warned him of the dangers of sailing alone.
Thesaurus for tip someone off from the Collins English Thesaurus