mid‧stream /ˌmɪdˈstriːm◂/
noun [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 [TahlilGaran] Dictionary of Contemporary English ▲