Definition of pièce rose in US English:
pièce rose
(also piece rose)
noun
A light or entertaining play or film; a comedy.
Origin
1950s; earliest use found in The Times. From French pièce rose from pièce + rose pink, especially as used by the playwright Jean Anouilh to categorize his works.
Pronunciation
pièce rose
/piːˌɛs ˈrəʊz/