From Longman Dictionary of Contemporary Englishsay your piecesay your pieceto give your opinion about something, especially something you do not like → say
Examples from the Corpus
say your piece• I was wondering what would happen when Dolly came out on to the stage and said his piece.• Now I have come forward and said my piece.• Sutton was allowed to say his piece.• The horse-trading that lies ahead will end only when the three key players have said their piece.• She'd come this far to say her piece and say it she would, come hell or high water.• The rules state that you let a guy say his piece and you consider what he said.• We each said our piece, each absolutely predictable.• He knew that he was clever and always wanted to say his piece in meetings. 