Etymology
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Mau Mau (n.)

secret society devoted to ending British rule in Kenya colony, by 1950, probably from the Kikuyu language of Kenya, but the exact meaning is disputed.

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dead end (n.)

"closed end of a passage," 1851 in reference to drainpipes, 1874 in reference to railway lines; by 1886 of streets; from dead (adj.) + end (n.). Figurative use, "course of action that leads nowhere," is by 1914. As an adjective in the figurative sense by 1917; as a verb by 1921. Related: Dead-ended; dead-ending; deadender (by 1996).

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