Etymology

marplot

M3A1R1P3L1O1T1

Today it means: Synonym of spoilsport, one who ruins other's plans or enjoyment of something. Full definition →

First used 18th c.
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The story

From mar (“to spoil, to ruin”) + plot (“plan”). In earliest use as a character name in The Busie Body, by Susanna Centlivre, in 1709. Compare addle-plot.

First known use, by meaning

  • from 18th c. Synonym of spoilsport, one who ruins other's plans or enjoyment of something.
  • from 18th c. Ruining a plan, interfering, spoilsport.

Etymology from Wiktionary, CC BY-SA 4.0.