TIPTOE n.
The end, or tip, of the toe. He must . . . stand on his typtoon [tiptoes]. Chaucer. Upon his tiptoes stalketh stately by. Spenser. To be, or To stand, a tiptoe or on tiptoe, to be awake or alive to anything; to be roused; to be eager or alert; as, to be a tiptoe with expectation.