run out of gas

run out of gas

1. Literally, to near the end of one's supply of gas in a car or other vehicle. I'm running out of gas, so we need to stop before we get on the highway.
2. By extension, to lose one's energy, motivation, or enthusiasm to continue doing something. After spending hours working on this project, I'm running out of gas—can we take a break?
See also: gas, of, out, run
Farlex Dictionary of Idioms.

run out of gas

mainly AMERICAN
If you run out of gas, you suddenly feel tired and lose energy or interest in what you are doing, and so you stop or fail. Miller, who missed second place by four seconds, said she `ran out of gas' close to the finish. The government's plan has run out of gas. Compare with run out of steam. Note: The image here is of a car stopping because it has run out of gas, or, in British English, petrol.
See also: gas, of, out, run
Collins COBUILD Idioms Dictionary, 3rd ed.

run out of gas

run out of energy; lose momentum. North American informal
See also: gas, of, out, run
Farlex Partner Idioms Dictionary

run out of gas

in. to lose momentum or interest. I hope I don’t run out of gas before I finish what I set out to do.
See also: gas, of, out, run
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions
See also:
  • get (some kind of) mileage out of (something)
  • get a lot of mileage out of
  • get mileage out of
  • get some kind of mileage out of
  • mileage
  • pass gas
  • berp
  • step on the gas
  • pipe away