ˈback-ˌburner BrE AmE , back‧bur‧ner /ˈbækˌbɜːnə $ -ˌbɜːrnər/ verb [transitive] informal
to delay doing something, because it does not need your attention immediately or because it is not as important as other things that you need to do immediately:
Allison back-burnered her prestigious law career when she had a baby.
The project has been backburnered.