An accumulator bet, also known as an acca, is a bet made up of several selections with one stake covering one bet. All selections must win for the bet to be a winner. More selections equal higher potential winnings, although the risks of losing are increased as well.
The chance of winning big, with some successful punters winning life-changing sums of money, has seen a continued growth in multi-selection accumulator bets.
With this rise in popularity, betting sites have had to compete with each other to try and entice and retain customers. So, most sites now offer accumulator bonuses, giving customers the chance to win even more.
Basically, an accumulator bonus is where the betting site will give winning customers a boost to their winnings. This will either be as a price boost before the bet was placed or as a percentage boost on top of the winnings for successful bets. It could also be related to number of accumulator bets placed, with a bigger bonus for a higher number of bets.