keep one's eyes open
— Verb
– English
~ pay attention; be watchful; "Keep your eyes peeled for any policemen"
keep open
— Verb
– English
~ retain rights to; "keep my job for me while I give birth"; "keep my seat, please"; "keep open the possibility of a merger"
keep out
— Verb
– English
~ prevent from entering; shut out; "The trees were shutting out all sunlight"; "This policy excludes people who have a criminal record from entering the country"