look out for somebody/something phrasal verb ( see also ↑ look )
1 . to pay attention to what is happening around you, so that you will notice a particular person or thing if you see them ⇨ lookout :
Look out for your Aunt while you’re at the station.
He’s looking out for a nice apartment downtown.
2 . to try to make sure that someone is treated well:
My older brother always looked out for me when we were kids.
look out for yourself/number one (=think only of the advantages you can get for yourself)