"Be down to someone" is a common phrase used to describe a person's loyalty or willingness to help and support someone. However, there are several other ways to convey this sentiment through synonyms, such as "be faithful," "be dependable," "be committed," "be reliable," "be devoted," "be loyal," or "be steadfast." These synonyms can help to convey a sense of trustworthiness and reliability in a person's character. Whether you're looking for ways to describe someone's unwavering support or seeking out the right words to express your own determination to be a trustworthy friend, there are plenty of synonyms for "be down to someone" that can help you do so effectively.