grand coup
/ˌɡrɒ̃ ˈkuː/noun
1A bold and strikingly successful stroke or move.
2 Whist and Bridge. The deliberate disposal of a superfluous trump by ruffing a winning card from the opposite hand.
Origin
Mid 18th century; earliest use found in William Kenrick (d. 1779), writer and translator. From French grand coup from grand + coup.