unsay
Unsay (verb) means to take back something that you said.
Etymology
The word passed into English through Middle English unseyen, unseien, which developed from Old English onseċġan ("to deny, renounce"), itself from Proto-West Germanic *andasaggjan ("to unsay, renounce, deny"), made up of un- and say. It is cognate with Dutch ontzeggen ("to deny") and German entsagen ("to renounce, abjure").