A shot that sails straight right of the target (for a right-hander) because the clubface never rotated back to square in time — essentially a push, but named for its cause rather than its flight. Blocks typically happen when the body outraces the arms or the hips thrust toward the ball (early extension), trapping the club behind you so the face hangs open while the path swings out to the right. The nervous fix — flipping the hands at the last instant to save it — turns the next block into a snap hook, which is exactly how a two-way miss is born.
Source: https://rapsodo.co.uk/blogs/golf/early-extension-and-two-way-miss · high confidence