1. save it for later/another time
keep the project/idea on the back burner
If you put something 'on the back burner', you make it a low priority because it isn't immediately relevant. This phrase comes from putting a pot on the back part of the stove or cooker while you focus on other preparations. Keeping a project or issue on the back burner means you intend to get back to it at a later stage. This is an idiomatic expression used in social and professional environments. Similar phrases are 'put it on hold', 'get back to it some other time' and 'deal with it later'.