The phrase "go to wall for" means to defend or support someone or something to the bitter end, even if it means putting your own reputation or well-being on the line. Some synonyms for this phrase include "stand behind," "stick up for," "back up," "fight for," "take the hit for," or "go to bat for." It's important to have people in our lives who we can count on to go to the wall for us, and we should strive to be that kind of loyal and supportive friend or ally to others as well.