fall wide of the mark
1. Literally, to be far from hitting a target. Wow, that shot really fell wide of the mark. Is the ball even still on the green? Watch out, that arrow is falling wide of the mark!
2. By extension, to be inaccurate or wrong. I never once said that! Your reporter's accusations fall completely wide of the mark. I thought I knew what real estate costs around here, but wow, I fell wide of the mark.