A badminton do-over, also known as a 'LET', is a rule in badminton that allows a player to replay a point if they feel that an interference has occurred. A LET can be called by either player and is usually used when the shuttlecock has been hit into the net or when a player has been distracted by an outside source. The LET is a way of ensuring fairness in the game and is an important part of badminton etiquette.