Running-on-empty Definition
verb
(idiomatic) Losing enthusiasm or willingness, lacking energy.
His interest in the program had been running on empty for a while. It's likely the program will be canceled.
Wiktionary
Origin of Running-on-empty
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An allusion to a vehicle operating with the fuel gage pointing to empty or near empty, likely to stop running in the very near future.
From Wiktionary
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