the Greek calends

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the Greek calends

A time that is expected to never arrive or occur. (Used after a preposition, especially "at," "on," or "till.") A reference to the day of the new moon and the first day of the month in the ancient Roman calendar, which the Greeks did not observe. You lent that leech John more money? It'll be at the Greek calends when he pays you back.
See also: Greek