fag end

基本解释

In the fag-end of its 12-year reign, Labour has lost even core supporters.
那些最坚定的支持者也在它12年统治生涯即将结束的时候，离它而去。
With the United States at the fag-end of a disastrous presidency, Brazil assembled 33 countries from across the Americas to discuss a host of issues ranging from defence to the economic slowdown.
正当美国在为布什政府的灾难性任期收拾残局之时，巴西聚集了美洲地区的33个国家，一同商讨着从国防到经济减慢的诸多问题。
Mr Brown needed to distinguish himself from his predecessor, impress a jaundiced electorate and do it in hurry—or face being seen as a fag-end failure.
布朗先生需要表现出他与前任者的不同，让心怀偏见的选民刮目相看，并速战速决——否则，他就会被人民看做是布莱尔失败后的余灰。
http://dj.iciba.com

With a grand tobacco settlement now a burnt-out fag-end in Washington, the struggle has returned to the courts—and the first big class-action lawsuit by smokers has come to trial.
ECONOMIST: The tobacco wars

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.