1. a male friend or relative of the groom who assists him at his wedding ceremony

Examples

• He asked his brother to be his groomsman at the wedding.
• The groomsman helped the groom get ready on his wedding day.
• Each groomsman wore a matching navy blue suit.
• The groomsman stood beside the groom during the ceremony.
• She watched as the groomsman escorted the bridesmaid down the aisle.
• The best man and three groomsmen gathered for photos before the wedding.