spend a penny

== English == === Etymology === From the act of putting a (pre-decimal) penny in the slot of a pay-toilet cubicle. === Pronunciation === === Verb === spend a penny (third-person singular simple present spends a penny, present participle spending a penny, simple past and past participle spent a penny) (UK, Ireland, Commonwealth, dated, euphemistic) To use the toilet. === References === “spend a penny”, in Collins English Dictionary, 2011–present.