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1. verb To literally peer or gaze out (of a place or thing). My cat loves looking out the window and watching all the birds and squirrels outside.
2. verb To be aware of one's surroundings in order to look for or notice something. Often used as an imperative. Look out—there's slippery rocks on that trail! I always look out for deals when I'm shopping.
3. noun One who keeps watch for potential problems or intruders in a particular situation. In this usage, the phrase is usually spelled as one word ("lookout"). We can't get caught, so you act as a lookout and give us a sign if you hear Mom or Dad coming.
4. noun The act of keeping watch for potential problems or intruders in a particular situation. In this usage, the phrase is usually spelled as one word ("lookout"). We can't get caught, so you keep a lookout and give us a sign if you hear Mom or Dad coming.
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.