magnum opus

US /ˌmæɡ.nəm ˈoʊ.pəs/
UK /ˌmæɡ.nəm ˈoʊ.pəs/
"magnum opus" picture
1.

магнум опус, главное произведение

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.
Его последний роман считается его главным произведением.
The symphony is widely regarded as the composer's magnum opus.
Симфония широко считается главным произведением композитора.