Webster's English Dictionary

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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