English In sports betting, a banker (or “bank” in some cases) refers to a bet considered the most reliable in an accumulator bet or a series of bets. It is assumed that this bet has a very high probability of winning. Normally, when a player includes a "banker" in their accumulator bet, the other bets can be riskier, but this selection is added as a guaranteed or almost guaranteed win, increasing the overall chances of success of the entire accumulator bet.
It is important to understand that even a "banker" does not guarantee a 100%igen win, but it is generally perceived as a low-risk bet. To place a risk-free bet, you can use the surebet strategy (betting arbitrage).