in sing.
1- informal, chiefly Brit. a tiring or unwelcome task〈非正式, 主英〉累活, 苦差事：
it's too much of a fag to drive all the way there and back again.
一路开车去又开车回来, 实在是件苦差使。
1.1
- Brit. a junior pupil at a public school who works and runs errands for a senior pupil〈英〉（英国公学中）供高年级学生差遣的低年级学生。
1
fagged, fagging
no obj. Brit. informal work hard, especially at a tedious job or task〈英, 非正式〉辛勤工作（尤指做冗长乏味的事）：he didn't have to fag away in a lab to get the right answer.
他不必为了得到正确答案而在实验室里干得那么辛苦。
1.1
- Brit. (of a public-school pupil) work and run errands for a senior pupil〈英〉（公学学生）供高年级学生使唤：
the lower boys in each house fagged for members of the Library.
每座寄宿舍的低年级男生都为图书馆成员服务。
词源
mid 16th cent. （as a verb in the sense 'grow weary'）： of unknown origin. Compare with FLAG1 .