Apostar, Spanish for “to bet”, sounds nothing like bet or any related English word.
But it turns out to be a close cousin of Posit and Position: Betting is indeed just an extreme form of putting forth a position or positing something — literally putting your money where your mouth is.
All come from the same Latin, positionem, which comes from the Latin root verb ponere (“to put”) from which we also get the Spanish for the same, poner.