Etymology
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horribile dictu 

Latin, "horrible to say, dreadful to relate," from neuter of horribilis (see horrible) + ablative supine of dicere "to say, speak" (from PIE root *deik- "to show," also "pronounce solemnly").

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mirabile dictu (interj.)

Latin, literally "wonderful to relate," from neuter of mirabilis "wonderful, marvelous, extraordinary; strange, singular" (see marvel (n.)) + ablative supine of dicere "to say, speak" (from PIE root *deik- "to show," also "pronounce solemnly"). The expression is found in Virgil. Mirable "wonderful, marvelous" was used in English 15c.

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mumbo jumbo (n.)

1738, name of an idol supposedly worshipped by certain tribes in Africa; said to be a corruption of words in Mandingo (one reconstructed version is Mama Dyumbo), but no likely source has been found in the languages of the Niger region, to which the original accounts relate. Meaning "big, empty talk" is attested from 1896.

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