'second-guess' originates from the United States, specifically from the practice of guessing the outcome of a baseball game after it has been played.

'second-guess' evolved from the practice of 'guessing' the outcome of a game, and eventually became a term used in broader contexts to mean questioning decisions after the fact.

Initially, it meant 'to guess the outcome of a game,' but over time it evolved into its current meaning of 'to criticize or question decisions after the fact.'