The phrase "stands behind" can be replaced with a number of synonyms depending on the context. One option is "supports," which implies a sense of loyalty and advocacy for a person or idea. "Endorses" is another synonym, which connotes a sense of official backing or approval. "Defends" is also a suitable replacement, particularly when referring to protecting one's reputation or beliefs. Other synonyms include "upholds," "backs up," "champions," and "protects." Ultimately, the choice of synonym depends on the tone and connotation desired within the given context.