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Pros and Cons of 4-fold bets\n\n Potentially it is possible that if the odds are good on an event far in the future and you fear they will be cut, adding them to an accumulator locks in the odds and also ensures a large stake on them (providing the first legs win).

The common "fold" expression means "100%", and it is very often misused in expressing comparisons. If something increases by 100% (that means it doubles), it increases one-fold. An increase of 180% is an increase of 1.8-fold. An increase from 200 to 1000 is a 400% increase, which means a 4-fold increase.