keep one's eyes peeled

Definition

To be on the alert, to be watchful.

Etymology

US, 19th century. Peeled probably refers to keeping one's eyelids retracted.

Example Sentences

• "And directly below is our Mesozoic jungle river -- where, if you are lucky, you just may catch a glimpse of a very rare carnivore. Keep your eyes peeled, everyone!"
• "lookouts posted to the port and starboard bows keep their eyes peeled for the ghostly outline of approaching traffic."