day of reckoning
day of reckoning {n. phr.}
1. A time when one will be made to account for misdeeds.
When the criminal was caught and brought to trial his victims said, "finally, the day of reckoning has come."
2. A time when one's will and Judgment are severely tested.
"You always wanted to run the department," the dean said to Professor Smith. "Now here is your chance; this is your day of reckoning."
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Source: A Dictionary of American Idioms