Belt/belt/ Definition 1 of 5Pro Tip 1/3Fashion Accessory A belt can be functional or a stylish addition to an outfit. She wore a gold belt to complement her dress. Pro Tip 2/3Symbol of Rank In martial arts, a belt often signifies the wearer's skill level. He just earned his black belt in karate. Pro Tip 3/3Metaphoric Usage Belt can imply restraint or preparation for difficulty. The team belted up for a tight game.