1. to warn in advance; to give advance notice of something potentially harmful or undesirable
Usage: third person singular present tense of ‘prewarn’

Examples

• The weather service prewarns residents about severe storms.
• She always prewarns her students about difficult exam questions.
• The company prewarns customers of potential service disruptions.
• The doctor prewarns patients about possible side effects.
• The system prewarns users before automatic updates begin.
• He prewarns his team about upcoming deadline changes.