1. past tense and past participle of alert; warned or notified of danger or a problem

Examples

• The security guard alerted the police about the suspicious activity.
• She alerted her neighbors to the gas leak.
• The teacher alerted parents about the schedule change.
• Emergency services were alerted immediately after the accident.
• The system automatically alerted users to the software update.
• He alerted his team to the potential risks involved.