Going overboard is a phrase that implies excessiveness and exaggeration. While this phrase can be used in various contexts, there are several synonyms that can be used to convey a similar meaning. These synonyms include overdoing, overindulging, overreacting, overstepping, going too far, exaggerating, and getting carried away. All of these phrases imply that someone is taking something too far or doing too much of something. Whether it's in a social or professional context, using these synonyms can help convey the same meaning as "going overboard," while adding a distinct flair to your language.