masterstroke

or mas·ter stroke

[ mas-ter-strohk, mah-ster- ]
/ ˈmæs tərˌstroʊk, ˈmɑ stər- /

noun

a masterly action or achievement; an extremely skillful or effective action: War was avoided by a masterstroke of diplomacy.

Origin of masterstroke

First recorded in 1670–80; master + stroke1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for masterstroke

masterstroke
/ (ˈmɑːstəˌstrəʊk) /

noun

an outstanding piece of strategy, skill, talent, etcyour idea is a masterstroke
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012