tiptoe
1. tip.toe \'tip-.to-, -'to-\ n : the tip of a toe; also : the ends of the toes : AROUSED, ALERT - on tiptoe 2. tiptoe av : on or as if on tiptoe 3. tiptoe aj 1: standing or walking on or as if on tiptoe 2: CAUTIOUS, STEALTHY 4. tiptoe vi : to stand, raise oneself, or walk or proceed on or as if on tiptoe