expression
he said, she said; dispute over what was said
Used when two people disagree about what was said, often in arguments or legal contexts. Functions as a noun-like phrase.
会議の内容について、言った言わないの水掛け論になった。
It turned into a he-said-she-said argument about what was said in the meeting.
契約の条件で言った言わないのトラブルが起きた。
A dispute arose over the contract terms, with each side claiming the other said something different.