Fold
Fold in betting refers to the number of selections in an accumulator or combination bet. A four-fold bet, for example, consists of four selections, all of which must win for the bet to be successful.
The more folds a bet has, the higher the potential payout, but also the higher the risk, as all selections must win for the bet to pay out. Common examples include double (2-fold), treble (3-fold), and higher accumulators like five-fold, six-fold, etc.