Past tense of bankroll; provided financial backing or money to fund a project, business, or activity.
From 'bankroll' (money in a roll or bundle), combining 'bank' and 'roll'; emerged in American English in the early 20th century to describe financing ventures.
The phrase 'bankroll' originally referred to actual rolls of bills in a person's pocket—when mobsters and wealthy entrepreneurs would literally carry their fortune as a rolled bundle of cash!
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