"Stand on tiptoe" is exactly right (or some people might say "Stand on tiptoe s ").
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
HSSWould it be idiomatic to say that even when he/she was already standing (when you only pull up your heels)?Yes, that's right. You lift your heels off the ground so that you are standing just on your toes. It's quite normal to say this to someone who is already standing.
HSSWould it be idiomatic to say that even when he/she was already standing (when you only pull up your heels)?