bankroll

The word 'bankroll' is a transparent American English compound from the late 19th century, directly combining two common nouns. The first element, 'bank', evokes the established institution of finance and money storage. The second element, 'roll', alludes to a cylindrical bundle, historically used to describe a roll of banknotes or coins. The logic is vividly literal: a roll of money substantial enough to constitute one's financial capital. As a verb, it naturally extends from the noun, meaning to supply such a fund. This compound exemplifies how concrete imagery (a roll of cash from a bank) evolves into an abstract term for financial backing.

Structure: bank (financial institution) + roll (a quantity of something rolled up) - bank: From Middle English banke, from Old Italian banca ("bench, moneychanger's table"), of Germanic origin. In this compound, it functions as the core concept of money or finance. - roll: From Middle English rolle, from Old French rolle ("roll, scroll"), from Latin rotulus ("small wheel"). In this compound, it functions as a metaphorical container or quantity, suggesting a bundled amount.