fag end

noun
1
the last part of a cigarette that is left after it has been smoked
ته سیگار
2
the last part of something, especially when it is less important or interesting
انتهای بی‌اهمیت, بخش کم‌ارزش, ته‌مانده, آخرین بخش
I only caught the fag end of their conversation.
the fag end of England’s industrial heyday