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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.
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.