From un- +‎ say.


unsay (third-person singular simple present unsays, present participle unsaying, simple past and past participle unsaid)

  1. To withdraw, retract (something said).
    • 1851, Herman Melville, Moby-Dick:
      And in the first place, you will be so good as to unsay that story about selling his head, which if true I take to be good evidence that this harpooneer is stark mad []
  2. To not have said (since this is physically impossible, usually in the subjunctive).
    I wish I could unsay that.
    There are some things I'd like to unsay... to my boss... right before he decided to fire me.