"Came up against" is a commonly used phrase to indicate a confrontation or obstacle that one has encountered. However, there are several synonyms that can be used instead, adding variety and nuance to one's language. These include "faced," "encountered," "confronted," "met," "bumped into," "stumbled upon," "challenged," and "tackled." Each of these words implies a slightly different tone and context, allowing writers and speakers to tailor their language and convey a precise meaning. By using synonyms, writers can avoid repetition and bring more color to their language, making their writing more engaging and expressive.