Either plural noun meaning amounts of money available for spending, or verb meaning to provide financial backing (third person singular present).
From 'bankroll': noun form borrowed from gambling slang where a 'roll' meant a bundle of bills, or verb form with standard '-s' for present tense third person.
In Las Vegas gambling culture, a gambler's 'bankroll' is sacred—it's the total money they brought to risk, and the cardinal rule is never gamble more than you can afford to lose!
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