1. to become wider or larger; to make something wider or larger
2. to speak or write about something at length
Usage: formal

Examples

• The doctor used drops to dilate the patient’s pupils.
• Her eyes dilated with fear when she saw the snake.
• Heat causes metal to dilate and expand.
• The blood vessels dilate to increase circulation.
• The professor began to dilate on the importance of the discovery.
• She dilated upon her travel experiences for over an hour.