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English definition of “peter out”

peter out

verb uk phrasal verb with peter   /ˈpiː.tər/ us    /-t̬ɚ/
to gradually stop or disappear: The fighting which started in the night had petered out by morning. The track petered out after a mile or so.Coming to an endCausing something to end
(Definition of peter out from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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