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peter out

phrasal verb with peter
 
/ˈpiː.tər/ US  /-t̬ɚ/ verb

Definition

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 Learner's Dictionary & Thesaurus © Cambridge University Press)
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