"Dropped by" is a commonly used phrase that is used to indicate a brief and casual visit. However, there are various synonyms for this phrase that can help you express your intended meaning more accurately and precisely. Some of the most popular synonyms for "dropped by" include "popped in", "stopped by", "swung by", "called in", "came by", "visited briefly" and "showed up". Each of these synonyms has a subtly different connotation, so it is essential to choose the right one that best matches the context and tone of your message or conversation. By using these synonyms, you can add variety and nuance to your communication, making it more interesting, engaging, and effective.