The ends of the toes. There are eight meanings listed in oed's entry for the word tiptoe Phrasal verb tiptoe around something/someone (definition of tiptoe from the cambridge advanced learner's dictionary & thesaurus © cambridge university press)
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Tiptoe (tiptoes or tippy toes) describes the human body posture and locomotion of removing the heel (s) of one or both feet from the ground.
Verb (used without object) tiptoed, tiptoeing to move or go on tiptoe, as with caution or stealth
She tiptoed out of the room. To walk or move quietly on one's toes The tip of a toe Standing or walking on one's toes
The children were on tiptoe before the birthday party American heritage® dictionary of the english language, fifth edition. If you tiptoe somewhere, you walk there very quietly without putting your heels on the floor when you walk She slipped out of bed and tiptoed to the window.
Tiptoe (not comparable) standing elevated, on or as if on the tips of one's toes
Tiptoe around [phrasal verb] tiptoe around (something) To avoid talking about (something) To talk about (something) only in an indirect way Factsheet what does the word tiptoe mean