Boiled over is a phrase that refers to a situation where emotions and tensions have reached their peak and can no longer be contained. Some synonyms that could be used instead of boiled over include exploded, erupted, burst, overflowed, and spilled over. These words all express a sense of pressure or tension that has finally reached its limits, resulting in a release of energy or emotions. The use of synonyms like these helps to create a more nuanced and varied vocabulary, making it easier to convey different tones and emotions in writing. It is always beneficial to have a wide range of synonyms for common phrases.