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stumble across/on/upon sth/sb

phrasal verb with stumble
 
 
/ˈstʌm.bl̩/ verb

Definition

C2 to discover something by chance, or to meet someone by chance: Workmen stumbled upon the mosaic while digging foundations for a new building.Finding and discovering
(Definition of stumble across/on/upon sth/sb from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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