tiptoe
verb
[ ˈtɪptəʊ ]
• walk quietly and carefully with one's heels raised and one's weight on the balls of the feet.
• "Liz tiptoed out of the room"
on tiptoe
• with one's heels raised and one's weight on the balls of the feet, especially in order to move quietly or make oneself taller.
• "Jane stood on tiptoe to kiss him"