not in a month of Sundays

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not in a month of Sundays

Not at any point; under absolutely no circumstances. Not in a month of Sundays did I think that I would actually win the lottery! A: "Do you think Samantha will agree to go on a date with Jake?" B: "Not in a month of Sundays!"
See also: month, not, of, Sundays

not in a month of Sundays

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never in a month of Sundays

If you say that something will not or will never happen in a month of Sundays, you mean it is very unlikely to happen. Their scheme will never work — not in a month of Sundays.
See also: month, not, of, Sundays