standing on tiptoes; tiptoe stance
Refers to the act or state of standing with the heels raised, balancing on the balls of the feet. Often used in contexts like ballet, reaching for something, or trying to be quiet.
See also: つま先立つ
She practiced ballet on tiptoes.
高い棚に手が届かなくて、つま先立ちになった。
I couldn't reach the high shelf, so I stood on tiptoes.