(informal) goggle-eyed stare, goofy eyes, naive look, idiot look

eyebags

(idiomatic) apple of someone's eye (a favourite, a particular preference, or a loved one)

(idiomatic) to roll one's eyes

(transitive) not to let out of one's sight, not to take one's eyes off, to keep an eye on

for the sake of (someone), for the love of (someone), just for (someone)

(idiomatic) to have eyes in the back of one's head

(idiomatic) to cost an arm and a leg, to cost the earth: to cost too much, to be very expensive

out of sight, out of mind

(informal) not to believe one's eyes