The phrase "bears one out" can be defined as confirming or supporting someone's statement or action. Therefore, the antonyms for this phrase could be words that describe the opposite behavior, such as contradicting, denying, opposing, or refuting. When someone disagrees with a statement or action, they could use these antonyms to express their disagreement. For instance, if someone says that the Earth is flat, someone else could contradict them by saying that it is round. Similarly, if someone supports a particular political candidate, another person might oppose them by supporting their rival candidate. In other words, the antonyms of "bears one out" describe a situation where someone is challenging or rejecting someone else's claim or behavior.