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1. One's limit in patience, temper, or equanimity, after which one loses control of one's emotions. Likened to the temperature at which a given liquid boils. I was at my boiling point with the kids last night. All their fighting and shouting drove me crazy!
2. The point at which a situation becomes critical, calamitous, or uncontrollable. Tensions in the region are at their boiling point—full-scale war seems inevitable now.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.