magnum opus
US /ˌmæɡ.nəm ˈoʊ.pəs/
UK /ˌmæɡ.nəm ˈoʊ.pəs/

1.
تحفة فنية, عمل عظيم
a large and important work of art, music, or literature, especially one regarded as the most important work of an artist or writer.
:
•
His latest novel is considered his magnum opus.
تعتبر روايته الأخيرة تحفته الفنية.
•
The symphony is widely regarded as the composer's magnum opus.
تعتبر السيمفونية على نطاق واسع تحفة الملحن.