the authentic origin of the phrase ‘on the nail’

    MEANING   of payments: without delay   ORIGIN   This expression refers to the fingernail and might originally have alluded to drinking fair and square. A clue might be provided by the French phrase payer rubis sur l’ongle (literally to pay ruby on the fingernail), which means to pay exactly what is due. (A variant, used by prostitutes, was rubis sur pieu, […]

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