Etymology
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dido (n.)

"prank, caper," 1792, slang, perhaps from the name of the legendary Carthaginian queen in the "Aeneid." Usually in phrase to cut didoes. Century Dictionary repeats a story that attributes it to her having made a bargain for as much land as could be covered by a hide, then cutting the hide into a long, thin strip so as to enclose a large tract, but this is not in the early references to the term, which regard its origin as mysterious.

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Definitions of dido

Dido (n.)
(Roman mythology) a princess of Tyre who was the founder and queen of Carthage; Virgil tells of her suicide when she was abandoned by Aeneas;
From wordnet.princeton.edu