SAY ONE'S PIECE is an idiom that means to express one's opinion or thoughts on a particular subject. The two crossword solutions for this term are RECITE (6 letters) and OPINE (5 letters). RECITE means to repeat words from memory, while OPINE means to express an opinion. Therefore, SAY ONE'S PIECE can be interpreted as expressing one's opinion or thoughts on a particular subject, either by repeating words from memory or by giving an opinion.