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Phrase(s): keep an eye out (for someone or something) [and] have an eye out (for someone or something); keep one’s eye out (for someone or something); have one’s eye out (for someone or something)
Fig. to watch for the arrival or appearance of someone or something. (See also keep one’s eyes open (for someone or something).) • Please try to have an eye out for the bus. • Keep an eye out for rain. • Have your eye out for a raincoat on sale.
McGrawhill's American Idioms And Phrasal Verbs