Engaged in wrestling or some other form of hand-to-hand struggle with one or more attackers. A grappling character can undertake only a limited number of actions. He does not threaten any squares, and loses his Dexterity bonus to AC (if any) against opponents he isn't grappling. For creatures, grappling can also mean trapping opponents in any number of ways (in a toothy maw, under a huge paw, and so on).