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look out (of) something
to gaze outward from inside something. (Of is usually retained before pronouns.) Look out of the window and see if it is raining. I looked out of the door to see what the weather was like.
to watch what is happening and be careful But when the ice suddenly breaks, look out.Related vocabulary: watch out
Usage notes: often used as an instruction: Someone shouted, “Look out, he's got a gun!”
Also, watch out. Be careful, be watchful, as in Look out that you don't slip and fall on the ice, or Watch out! There's a car coming. [c. 1600] Also see look out for.
To be watchful or careful; take care: If you don't look out, you could fall on the ice. The campers looked out for each other on the hike.