boil up phrasal verb (
see also boil)
1. if a situation or emotion boils up, bad feelings grow until they reach a dangerous level:
She could sense that trouble was boiling up at work. He could feel the anger boiling up inside him.2. boil something ↔ up to heat food or a liquid until it begins to boil:
Boil the fruit up with sugar. [TahlilGaran] Dictionary of Contemporary English ▲