keep a weather eye out

keep a weather eye out

An instruction to monitor someone or something, often because the person or thing in question may turn out to be dangerous. I think Tom's a thief, so keep a weather eye out around him. I'd keep a weather eye out with this storm that's brewing—we may have to evacuate.
See also: eye, keep, out, weather
Farlex Dictionary of Idioms.

keep a weather eye out

Also, keep a weather eye on or open . Be extremely watchful or alert, as in We should keep a weather eye on our competitors in case they start a price war. The precise allusion in this expression is disputed, but presumably it refers to watching for a storm. [Early 1800s]
See also: eye, keep, out, weather
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • keep (one's) weather eye open
  • keep a
  • keep a weather eye open
  • keep weather eye open
  • make a joke of (something)
  • make a joke of something
  • seem like
  • seem like (something)
  • jam into (something)
  • say to face