1
general::
A climax or crisis; a high degree of fury, excitement, or outrage. For example, The union's disgust with management has reached the boiling point. This metaphoric term alludes to the temperature at which water boils. [Second half of 1700s] 2. have a low boiling point. Become angry quite readily, as in Don't tease her anymore? she has a low boiling point. This phrase means that it takes less heat than usual for a boiling point to be reached. [First half of 1800s] Also see BOIL OVER; MAKE ONE'S BLOOD BOIL.
American Heritage Idioms
2
general::
noun VERB + BOILING POINT reach | bring sth to, heat sth to Bring the sauce to boiling point. PREP. at ~ Add the powder when the water is at boiling point.
Oxford Collocations Dictionary