The 'back burner' group
These nouns are used to indicate that someone or something is treated in a way that shows they are important or not important.
on ice on the back burner on the cutting edge (of ...) on the front burner on the sidelines
The deal has been put on ice because there appears to be a problem over the fee.
Increasingly Britain is in danger of being left on the sidelines, as the rest of Europe moves willingly towards further integration.