Английский словарь американских идиом - eye out

Careful watch or attention; guard. - Used after "keep", "have" or "with". * /Keep an eye out. We're close to Joe's house./ - Usually used with "for". * /Mary has her eye out for bargains./ * /They went through the woods very quietly, with an eye out for Indians./ Compare: LOOK OUT(2), ON GUARD, ON THE ALERT, ON THE WATCH.