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

1.
mirar por uno mismo, pensar solo en uno mismo
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.
En esta industria competitiva, realmente tienes que mirar por ti mismo.
•
She's always been someone who looks out for number one, even at the expense of others.
Siempre ha sido alguien que mira por sí mismo, incluso a expensas de los demás.