keep eye out

keep (one's) eye(s) out (for something or someone)

To remain vigilant or carefully watchful (for something or someone). They should be arriving any minute, so keep your eyes out. Keep your eye out for a gift we could give your mother. Tell the team to keep their eyes out for the health inspector. I heard he'll be doing a surprise inspection soon.
See also: keep, out, something
Farlex Dictionary of Idioms.

keep one's eye(s) out

(for someone or something) Go to keep an eye out (for someone or something).
See also: eye, keep, out
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • keep (one's) eye(s) out (for something or someone)
  • keep (one's) eye out for (someone or something)
  • keep an eye out for
  • keep an eye out for (someone or something)
  • keep eyes
  • keep eyes open
  • keep (one's) eye(s) open (for someone or something)
  • keep one's eyes open
  • keep (one's) eye(s) peeled (for something or someone)
  • keep eyes peeled