say one's peace
say one's peace or speak one's piece {v. phr.}
To say openly what you think; say, especially in public, what you usually say or are expected to say.
John told the boss that he thought he was wrong and the boss got angry. He said, "You've said your little piece, so go on home."
Every politician got up and said his piece about how good the mayor was and then sat down.
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Source: A Dictionary of American Idioms