noun
a piece of advice or inside information given to someone
verb
to give someone a hint or warning about something
preposition
used to indicate the starting point of a race or competition
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The informant decided to tip off the authorities about the illegal activities happening in the neighborhood.
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I heard that someone tipped off the police about the party next door.
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I'm gonna tip off my friend about the surprise party we're planning for her.
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Her sudden change in behavior tipped off her friends that something was wrong.