Longman Dictionary of Contemporary English homepage

midstream

 noun
     
mid‧stream [uncountable]
1

in midstream

when something has started and is still happening:
They had to drop the experiment in midstream.
He interrupted the official in midstream (=while the official was still speaking).
2 the middle part of a river
in midstream
The boat had anchored in midstream.
—midstream adverb
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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