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Related to watch out: look out
To pay attention (usually because danger is imminent). Often used as an imperative. You need to watch out for all these cords—they're a serious tripping hazard. Watch out! There's a car coming!
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
1. To be careful or on the alert; take care: If you don't watch out, you'll fall on the ice.
2. watch out for To be careful of some danger: Watch out for falling rocks!
The American Heritage® Dictionary of Phrasal Verbs. Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.