The phrase "says one piece" might be difficult to find antonyms for, as it is quite idiomatic and specific. However, we could break it down into its individual parts to find antonyms for "says" and "one piece". Antonyms for "says" could include words like "silences", "whispers", "keeps quiet", or "withholds". Antonyms for "one piece" might include phrases like "shattered", "in bits", "fragmented", or "broken apart". So, some possible antonyms for "says one piece" could be "whispers shattered", "keeps quiet in bits", or "withholds fragmented". These may not be fully idiomatic, but they could still convey a similar sense of opposition to the original phrase.