expression, godan verb (-ru)
come to an end; close the curtain
Idiomatic expression literally meaning 'to become a curtain', used figuratively for something ending or concluding, often in a dramatic or final sense.
長かった会議もようやく幕になった。
The long meeting finally came to an end.
彼の政治家としてのキャリアは
His political career came to an end with the scandal.