changing horses in midstream

Verb

change horses in midstream (third-person singular simple present changes horses in midstream, present participle changing horses in midstream, simple past and past participle changed horses in midstream)

1. (idiomatic) To change one's plan or approach when an effort is already underway or at another inopportune time.
   • A change in the weather is known to be extreme / But what's the sense of changing horses in midstream?1975, Bob Dylan, “You're a Big Girl Now”, in Blood on the Tracks