de·mon·e·tize /(ˌ)diˈmɑnəˌtaɪz, ˈmʌ-/
(vt.)使通貨廢止使用
de·mon·e·tize v. t. To deprive of current value; to withdraw from use, as money.
They [gold mohurs] have been completely demonetized by the [East India] Company. --R. Cobden.
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demonetize
v : deprive of value for payment; "demonetize a coin" [syn: demonetise]