on the back burner
US /ɑn ðə bæk ˈbɜrnər/
UK /ɑn ðə bæk ˈbɜrnər/

1.
if something is on the back burner, it is temporarily not being dealt with or considered, because it is not urgent or important
:
•
We've put the new project on the back burner for now.
•
My career took a back seat when I had children, but now it's no longer on the back burner.