waste not, want not
idiomPart ofwant
waste not, want not — idiom
1. If you do not waste things, you will not lack them later.
1.idiom
Definition
If you do not waste things, you will not lack them later.
Example
My grandmother always said, 'Waste not, want not,' and she saved every scrap.
He finished all the leftovers because he believes waste not, want not.