1N-COUNT 烟蒂 A fag end is the last part of a cigarette, which people throw away when they have smoked the rest. 烟蒂 [British, informal]
2N-COUNT [usually singular](尤指枯燥乏味或不重要的)结尾，末尾 If you refer to the fag end of something, you mean the last part of it, especially when you consider this part boring or unimportant. (尤指枯燥乏味或不重要的)结尾，末尾 [informal]
He never had much confidence in his judgement at the fag-end of the working day. [+ of]