also fag-end
(~s)
1.
A ~ is the last part of a cigarette, which people throw away when they have smoked the rest. (BRIT INFORMAL)
= butt
N-COUNT
2.
If you refer to the ~ of something, you mean the last part of it, especially when you consider this part boring or unimportant. (INFORMAL)
He never had much confidence in his judgement at the fag-end of the working day.
N-COUNT: usu sing, N of n