having had enough; flatly refusing; wouldn't do for anything
Strongly refusing or rejecting something, often with a sense of being fed up. Used in phrases like 真っ平ごめんだ to mean 'I've had enough' or 'I absolutely refuse'.
I've had enough of his selfishness.
I flatly refuse to go outside on such a cold day.
begging pardon
Rare, archaic use as a humble apology or request for forgiveness. Modern usage is almost entirely the refusal sense.
In old documents, 真っ平御免 was sometimes used as an apology.