cashier (n.)

"person in charge of money," 1590s, from Middle French caissier "treasurer," from caisse "money box" (see cash (n.)). The immediate source of the English word might be Middle Dutch kassier.

cashier (v.)

"dismiss from an office or place of trust," 1590s, from Middle Dutch casseren, kaseeren "to cast off, discharge," from French casser "to discharge, annul," from Late Latin cassare "annul," from Latin cassus "void, empty" (from extended form of PIE root *kes- "to cut"). Related: Cashiered; cashiering.

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