When it comes to synonyms for the phrase "bubble over," there are plenty of options to choose from. Some of the most common alternatives to this phrase include "overflow," "spill over," "brim over," and "run over." These terms all refer to a situation in which something is unable to be contained and spills or overflows from its container. Other synonyms for "bubble over" may include "pour out," "gush," "burst," and "erupt." Overall, there are numerous words and phrases that can be used to describe a situation in which something exceeds its boundaries and spills out in an uncontrollable manner.