warm up
US /wɔːrm ˈʌp/
UK /wɔːrm ˈʌp/

1.
2.
to become more friendly, lively, or enthusiastic
:
•
The crowd started to warm up as the band played their favorite songs.
•
It took him a while to warm up to the idea of moving.
to become more friendly, lively, or enthusiastic