back burner
http://grafx.dli.com/slang/images/22...burner_220.jpg
Definition: Not an urgent priority. To put something on the 'back burner' is to put something off until later
Example: 1) We worked hard on the project at first, but when a new project came along, we put it on the back burner
Etymology: The 'back burner' of a stove is where you put things that are slowly cooking, and that you can leave alone for a while
