The phrase "run into" has various synonyms that can be used to convey similar meaning. Some words that can be used instead are "encounter," "meet," "stumble upon," "chance upon," "cross paths with," "bump into," "come across," "find oneself face-to-face with," "collide with," "happen upon," among others. These synonyms are useful for providing context and adding variety to the language. The choice of synonym may depend on the scenario and the writer's preference. Whether it may be an unexpected meeting or an accidental encounter, it's good to know synonyms to use for the word "run into".