unsay

Etymology

From Middle English unseyen, unseien, from Old English onseċġan (“to deny, renounce”), from Proto-West Germanic *andasaggjan (“to unsay, renounce, deny”), equivalent to un- + say. Cognate with Dutch ontzeggen (“to deny”), German entsagen (“to renounce, abjure”).

verb

1. To withdraw, retract (something said).
2. To cause something not to have been said; to make it so that one never said something (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.