To scrabble is to grasp or grope. If you lose your footing while rock climbing, you'll scrabble around with your fingers for a ledge to hang onto.
The verb scrabble means to scratch or grab with your hands, the way you might search for something in a dark room or clutch at something frantically as you drop it. Scrabble also describes an animal's movements, like the sound of a squirrel that scrabbles, or scurries, out of your garbage can. Scrabble is also the name of a board game that involves making words out of letter tiles. Scrabble comes from the Dutch schrabben, "to scratch."