The phrase "ate one's words" is used when someone has to retract or take back something they said because it was incorrect or inappropriate. Antonyms, or opposite words, for this phrase could include standing by your words, affirming your statement or even doubling down. These antonyms suggest that instead of backing down or admitting fault, one should defend their original statement, no matter how controversial or unpopular it may be. However, in certain situations, it may be better to simply acknowledge and correct a mistake rather than stubbornly holding onto a false belief. Ultimately, the best approach may depend on the circumstance and your own personal values.