The phrase "go like lightning" is an idiom used to describe something moving or happening very quickly. The antonyms, or opposite meanings, of this phrase would be slow or stagnant. So, if something is not going like lightning, it could be moving slowly, dragging its feet, or even stalled. These antonyms may not be as exciting or exhilarating as the original phrase, but they do provide us with a new way to describe things that may not be moving as fast as we would like. It all depends on the context and what you're trying to convey.