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to peter out
[phrase form: peter]
01
to gradually end or fade away, often due to becoming weakened
Example
The trail peters out about half a mile up the mountain, making it difficult to follow.
The protests were strong in the beginning but petered out when support waned.
02
to gradually fade away to the point of stopping or disappearing
Example
After running the marathon, Sarah petered out and had to rest for the whole day.
The team was enthusiastic in the first half of the project, but they began to peter out as the workload increased.
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