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stumble across/on/upon sth/sb

Phrasal Verb with stumble
 
 
/ˈstʌmbl/ verb [I]

Definition

to discover something by chance, or to meet someone by chance: I stumbled across these photographs while I was cleaning out my desk.
(Definition of stumble across/on/upon sth/sb from the Cambridge Learner's Dictionary © Cambridge University Press)

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