When it comes to defending something or someone, there are many synonyms that you can use in place of the phrase "come defense of." Some alternatives include "in support of," "on behalf of," "to uphold," "to back," "to champion," "to protect," "to stand by," "to vouch for," "to guarantee," "to reinforce," and "to fortify." Regardless of which term you choose, the sentiment is the same - you are standing up for something or someone, and you are willing to go to bat for them. Whether it's a friend, a cause, or a belief, it's important to be able to articulate your position with clarity and conviction.