While "de-claiming" refers to the act of renouncing or denying a statement or claim, its opposite, or antonym, would be asserting or affirming. To assert is to declare or state something confidently, while affirming is to validate or confirm a statement or belief. Other antonyms for "de-claiming" could include acknowledging, accepting, admitting, avowing or professing. These words are all associated with expressing agreement or affirmation, which contrasts with the negative connotation of "de-claiming." By using these antonyms, writers can convey a sense of conviction or confidence, and thereby support their ideas in a convincing manner.