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
踮着脚
Jane stood on tiptoe to kiss him.
简踮起脚吻他。
Full of anticipation; eager
满怀期待的；急切的
The children were on tiptoe before the birthday party.
孩子们都急切地等待着生日晚会的开始