A meddlesome person whose activity interferes with the plans of others.
“The old marplot has discovered the baby,” Monica whispered. “I suppose it cried and woke him up, and now he thinks he's witness to a miracle.”
That foils a plot; interfering.
Let us argue the point with this pert, unruly, marplot conscience of mine…
From mar + plot. In earliest use as a character name in The Busy Body, by Susanna Centlivre, in 1709.
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