"Be pertinent to" is a common phrase used to indicate relevance or the level of importance of something in a specific context. It means that something is applicable or appropriate in a particular situation. This phrase can be substituted with other synonyms such as, "be relevant to," "relate to," "pertain to," or "be germane to." These words convey the same idea of being significant, and having a direct, meaningful connection to something. Using synonyms for "be pertinent to" can help to add variety to one's language, and make their writing more interesting and expressive.