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keep a weather eye out

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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]

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.

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