Antonyms for the phrase "show white flag" may include terms such as "resist," "fight on," or "persist." These words suggest a refusal to give up, a determination to continue a struggle even in the face of adversity. Other opposing terms might include "ignore," "disregard," or "dismiss," implying a lack of concern or attention to a particular situation. In any case, the use of antonyms can help to provide a more nuanced view of a concept or phrase, offering a range of possible ways to approach a given situation or problem.