godan verb (-su), transitive verb
say everything one wants to say; exhaust a topic
Used when someone talks until they have nothing left to say, or when a subject is discussed so thoroughly that there is nothing more to add. Often implies a sense of completion or satisfaction.
彼は自分の意見を語り尽くした。
He said everything he wanted to say about his opinion.
このテーマはもう語り尽くされている
This topic has already been exhausted.