The middle of a stream or river.

in midstream, abruptly

In the middle of a running body of water. / (figuratively) During the execution of (something); in the middle of (an activity).

plural of midstream

(idiomatic) To change one's plan or approach when an effort is already underway or at another inopportune time.

(idiomatic) Alternative form of change horses in midstream

Third-person singular simple present indicative form of change horses in midstream

present participle of swap horses in midstream

Third-person singular simple present indicative form of swap horses in midstream

simple past tense and past participle of change horses in midstream