Accumulator (Acca)

An accumulator (or multi, acca, parlay) combines two or more selections into a single bet. The odds of each selection multiply, producing a much larger potential payout than a single bet — but ALL selections must win. If even one loses, the entire bet loses. Accumulators are popular because of the huge payout potential, but the operator margin compounds with each leg, making heavy accumulators (8+ legs) statistically poor value over time.