gun for

US /ˈɡʌn fɔːr/
UK /ˈɡʌn fɔːr/
"gun for" picture
1.

to try to get or achieve something, especially with great determination

:
He's really gunning for that promotion.
The team is gunning for the championship this year.
2.

to try to harm or defeat someone

:
The boss has been gunning for him ever since the argument.
They're gunning for us, so we need to be careful.