To walk quietly with only the tips of the toes touching the ground.
Standing elevated, on or as if on the tips of one's toes.
Moving carefully, quietly, warily or stealthily, on or as if on the tips of one's toes.
The tip of the toe.
To walk, move or stand unsteadily or falteringly; threatening to fall.
To be on the brink of collapse.
An unsteady movement or gait.