The term "out-rivals" refers to exceeding or surpassing another in a particular field, activity or skill. Its antonyms are words that convey the opposite, such as "lag behind", "trail", "lose", "fall short", "underperform" and "trail behind." These words suggest that one is not meeting expectations, or is performing at a lower level than the norm. Another antonym for "out-rivals" is "equals," which implies that two entities are equally matched in their capabilities, achievements, or skills. In essence, antonyms for "out-rivals" explain that there are times when someone may not be the best in a particular domain, and may need to improve in order to catch up or keep up with others.