run out of steam

run out of steam (British, informal, American & Australian, informal)

to suddenly lose the energy or interest to continue doing what you are doing. She'd been talking for two hours and was just starting to run out of steam. I worked really well for two months of the project then I suddenly ran out of gas.

See also: run, steam

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run out of steam

to lose the energy or interest to continue. She'd been talking for two hours and was just starting to run out of steam.

See also: run, steam