the Greek calends

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Related to calends: Roman calendar
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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
References in periodicals archive ?
Calends was the first day of each Roman month; among the Greeks, it represented a figurative, godly time, since the Greeks observed no calends.
Paul's Day (celebrating his conversion) closes the calends of the new year, and the weather that prevails on that day will prevail for the rest of the year (Coltro, 65).