Meaning of the word "look out for number one" in English

What does "look out for number one" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

look out for number one

US /lʊk aʊt fɔr ˈnʌm.bər wʌn/
UK /lʊk aʊt fɔr ˈnʌm.bər wʌn/
"look out for number one" picture

Idiom

1.

to always put your own needs and interests before those of other people

Example:
In this competitive industry, you really have to look out for number one.
She's always been someone who looks out for number one, even at the expense of others.
Learn This Word at Lingoland