waste not, want not

not want to do that

To be in a state of doing or being about to do something that one is likely to regret; usually unknowingly or forgetfully.

want for nothing

To have everything one needs.

want someone's nachos

To covet another; to envy one's accomplishments or qualities.

want to know

To ask (used as a dialogue marker or introductory statement).

waste away

To lose energy or become weak and feeble.

waste breath

To speak in a manner which is needless or futile; in discussion or argument to make points which are not appreciated or heeded.

waste of breath

Needless or unnecessary speech.

waste of space

An utterly worthless person; one who, as it were, is unworthy of the space which they occupy.