keep eyes peeled

Related to keep eyes peeled: keep an eye open

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

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

keep one's eyes peeled

(for someone or something) Go to keep one's eyes open (for someone or something).
See also: eye, keep, peel
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.
See also:
  • keep (one's) eye(s) peeled (for something or someone)
  • keep an eye peeled (for something or someone)
  • keep eye out
  • keep (one's) eye(s) out (for something or someone)
  • keep (one's) eye(s) skinned (for someone or something)
  • keep an eye out for
  • keep an eye out for (someone or something)
  • keep (one's) eye out for (someone or something)
  • keep (one's) eye(s) open (for someone or something)
  • keep eyes open
References in periodicals archive
They want you to keep eyes peeled and inform them of any pine marten sightings.
And afterwards the Gloucester ace revealed on his Twitter page: "Been told to keep eyes peeled for roo with blue paint on its head - not so friendly and loves a scrap.
A stack of vintage books in a corner of the room would make a great lamp table and keep eyes peeled for a vintage clock and art for the wall.
Would-be occupiers need to keep eyes peeled for builders' site hoardings, or even planning applications, if they're to be first in the queue for new homes in popular locations.
Keep eyes peeled for the black and white posts as there are many other crossing tracks back to the car park.
And even when a straighter stretch finally presents itself, drivers need to keep eyes peeled for Brunstrom's ticket collectors.