"Unsays" is an uncommon word that refers to withdrawing or retracting something that has been said. The act of unsaying can have a significant impact on a conversation or debate, as it can alter the course of the discussion.
There are several synonyms for the word "unsays" that can be used to convey the same meaning. Some of these include retract, revoke, recant, disavow, retract, rescind, abandon, repudiate, recall, and retract.
Each of these synonyms has varying degrees of emphasis and can change the tone of a sentence depending on which one is chosen. No matter which word is used, they all signify a backing away from something previously stated, and can be useful in a variety of contexts.