an Entity references as follows:
Rough-and-tumble play, also called play fighting, is a form of play where participants compete with one another attempting to obtain certain advantages (such as biting or pushing the opponent onto the ground), but play in this way without the severity of genuine fighting (which rough-and-tumble play resembles). Rough-and-tumble play is one of the most common forms of play in both humans and non-human animals.