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An officious meddler whose interference compromises the success of an undertaking.
[After Marplot, , a character in The Busy Body, a play by Susannah Centlivre (1669-1723).]
a person who interferes with, or spoils, a plot or plan
a person who spoils a plot, design, or project by meddling.
marplot- A person who spoils a plot or who ruins the success of an undertaking or process.
See also related terms for success.