Using 'tip off' implies sharing information secretly, often to prevent something from happening. The gang was tipped off about the raid and fled.
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Insider Knowledge
'Tip off' usually means the information comes from a source with special access or knowledge. The employee tipped off the journalist about the scandal.
Pro Tip 3/3
Urgency Suggested
The phrase often suggests that immediate action is needed following the information given. They were tipped off to evacuate before the storm hit.