midstream

noun

1. the middle of a stream.
2. the middle period of a process, course, or the like.

noun

1. the middle of a stream or river
2. the middle of a process or actionthey tried to change the rules in midstream

adverb, adjective

3. in or towards the middle of a stream or rivermoored midstream

n.also mid-stream, Old English midstream; see mid + stream (n.). see change horses midstream.