Fig. to lose one's temper. Every time anyone mentions taxes, Mrs. Brown flies off the handle.If she keeps flying off the handle like that, she'll have a heart attack.
Lose one's temper, as in Tom flies off the handle at the slightest setback. This metaphoric expression alludes to the loosened head of a hammer flying off after a blow. [Early 1800s]
To lose one's temper. The image is one of speed, as rapidly as an axe head parting company from the handle during a down stroke. The phrase is credited to the 19th-century humorist Thomas Haliburton.