weather eye
weather eye {n.}
1. Eyes that can tell what the weather will be.
Grandfather's weather eye always tells him when it will rain.
2. Eyes ready or quick to see; careful watch. — Usually used in phrases like "keep a weather eye on", "open", or "out for".
Mrs. Brown kept a weather eye on the children so they wouldn't hurt each other.
Keep a weather eye out for Uncle George at the store.
Keep a weather eye open for deer.
The police have a weather eye out for the robbers.
Compare: LOOK OUT.
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Source: A Dictionary of American Idioms