Definition of midstream noun from the Oxford Advanced American Dictionary

 

midstream

 noun
noun
NAmE//ˌmɪdˈstrim//
 
[uncountable]
 
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  • the middle part of a river, stream, etc. We anchored in midstream. The boat drifted out into midstream.
  • Idioms
    change/switch horses in midstream
     
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    to change to a different or new activity while you are in the middle of something else; to change from supporting one person or thing to another
    (in) midstream
     
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    in the middle of doing something; while something is still happening Their conversation was interrupted midstream by the baby crying.
    See the Oxford Advanced Learner's Dictionary entry: midstream