When building an accumulator bet, or acca, you place several bets together for bigger profits than had you placed them separately from each other. This also means that a single lost leg brings your whole slip down like a house of cards. Many platforms offering football betting online are aware of this possibility, so they offer acca insurance: if only one leg on your acca loses, you get your stake back, which is still better than losing it completely.  There are usually some restrictions in place, like not being able to use this feature as much as you want, but only once per day or even week. Additionally, not every bookie offers this: if this sort of safety net is important to you, check which football betting sites offer this when you’re choosing where to open your account.