Idiom
change horses in the middle of the stream
Theme: CHANGE
to make major changes in an activity that has already begun; to choose someone or something else after it is too late.I'm already baking a cherry pie. I can't bake an apple pie. It's too late to change horses in the middle of the stream.The house is half-built. It's too late to hire a different architect. You can't change horses in the middle of the stream.