To lose energy or motivation.
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To lose energy, motivation, or momentum part-way through a task or effort.
When you run out of steam, you start something with enthusiasm but gradually slow down or stop because your energy is depleted.
It is used when someone or something loses the drive to keep going.
"Hit a Wall"
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Reaching a sudden point of complete exhaustion or mental block that stops progress abruptly
"Burn Out"
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Reaching a state of complete physical and mental exhaustion from prolonged stress or overwork
"Run out of Steam"
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Gradually losing energy or motivation and slowing down mid-effort