I spoke too soon.
1. Fig. I am wrong.; I spoke before I knew the facts. Bill: I know I said I would, but I spoke too soon. Sue: I thought so. John: You said that everything would be all right. Jane: I spoke too soon. That was before I learned that you had been arrested.
2. Fig. What I had said was just now contradicted. Bob: It's beginning to brighten up. I guess it won't rain after all. John: I'm glad to hear that. Bob: Whoops! I spoke too soon. I just felt a raindrop on my cheek. Bill: Thank heavens! Here's John now. Bob: No, that's Fred. Bill: I spoke too soon. He sure looked like John.