Толковый словарь английского языка Oxford English Reference - eyeball

n. & v. --n. the ball of the eye within the lids and socket. --v. US sl. 1 tr. look or stare at. 2 intr. look or stare. Phrases and idioms eyeball to eyeball colloq. confronting closely. to (or up to) the eyeballs colloq. completely (permeated, soaked, etc.).