1. to warn someone in advance about something that may happen

Examples

• The weather service forewarned residents about the approaching hurricane.
• I should forewarn you that the test will be very difficult.
• The company forewarned employees about possible layoffs.
• Let me forewarn you about the traffic delays on that route.
• The doctor forewarned the patient about potential side effects.
• We were forewarned that the meeting might run late.