Mud-flap is a term usually used to refer to a rubber or plastic device usually found on cars and trucks, which is installed behind each wheel to prevent mud and water from being thrown up onto the body of the vehicle. However, there are various other words that can be used to describe this mud-flap. Some of the synonyms for the word mud-flap include mudguard, splash guard, fender mudguard, wheel arch, skirting board, bib, and rubber flaps. All of these words accurately describe the purpose and appearance of the device, and can be used interchangeably depending on personal preference and context.