Handle

Definition and stakes

John S. Farmer,  Slang and its analogues past and present…

“ To fly off the handle, verb. phr. (American pioneer) .—To lose temper; to fail of a promise; to jilt; to die; also to slip off the handle (q.v.) ; to disappoint in any way. [In pioneer life for an axe to part company with its handle is a serious trial to temper and patience.]
1843–4. Haliburton, The Attaché. You never see such a crotchical old critter as he is. He flies right off the handle for nothing.
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Source: Gutenberg

Portrait of William Kingdon Clifford William Kingdon Clifford,  Popular Science Monthly (1873)

“ You go away and say to yourself: "Every thing resembles this scarecrow. Every thing has a purpose." And from that day the word "cause" means for you what Aristotle meant by "final cause." Or you go into a hair-dresser's shop, and wonder what turns the wheel to which the rotatory brush is attached. On investigating other parts of the premises, you find a man working away at a handle. ”
Source: Wikisource

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