waste of space
idiomAn utterly worthless person; one who, as it were, is unworthy of the space which they occupy.
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factor space
A space obtained from another by identification of points that are equivalent to one another in some equivalence relation.
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space out
To become distracted or disoriented; to lose attention or focus.
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waste away
To lose energy or become weak and feeble.
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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.
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waste not, want not
If one is not wasteful then one will not be in need.
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waste of breath
Needless or unnecessary speech.
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watch this space
An indication that a development will follow.