look out for number one
US /lʊk aʊt fɔr ˈnʌm.bər wʌn/
UK /lʊk aʊt fɔr ˈnʌm.bər wʌn/
1.
to always put your own needs and interests before those of other people
:
•
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.