Rue The Day Meaning

(idiomatic) to seriously regret one's actions.

Example: 1987, Withnail and I:
  I: I think there may be something living in there. I think there may be something alive.
  Withnail: What d'you mean? A rat?
  I: It’s possible. It’s possible.
  Withnail: Then the fucker will rue the day!

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