There are 3 definitions of fag in English:

fag1

Syllabification: fag

noun

[in singular] informal , chiefly British
1A tiring or unwelcome task: it’s too much of a fag to drive all the way there and back again
More example sentences
  • So instead of a relaxing end to a busy social week, diving has become a fag and a beastly chore.
1.1British A junior pupil at a private school who works and runs errands for a senior pupil.
More example sentences
  • Unlike most of the top pros who, when the camera's are pointed elsewhere, treat their caddies as if they were public school fags, Garcia is genuinely close to his bagman, South African Glenn Murray.
  • He looks like he should be a fag at a public school with those impish, worried looks.

verb (fags, fagging, fagged)

[no object] British informal Back to top  
1Work hard, especially at a tedious job or task: he didn’t have to fag away in a lab to get the right answer
More example sentences
  • Hardly ideal circumstances for a history-making start, but after a few innings things fag into place for the hard throwing right-hander.
  • I couldn't be fagged doing it tonight, as I am recovering from the horror of dragging two toddlers around the Royal Melbourne Show all day.
1.1(Of a pupil at a private school) work and run errands for a senior pupil.
More example sentences
  • Kerr is a strange fish; I once fagged for a chap like him at Fettes.
  • In fact, according to a recent biography of Jackson, Churchill actually fagged for two England captains, having earlier served Archie MacLaren as well.
  • Letwin had his rebellious moments, campaigning against fagging, the custom of older pupils using younger ones as servants, yet his underlying politics remained conventional.

Origin

mid 16th century (as a verb in the sense 'grow weary'): of unknown origin. Compare with flag1.

Definition of fag in:

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Word of the day setose
Pronunciation: ˈsiːtəʊs
adjective
bearing bristles or setae; bristly

There are 3 definitions of fag in English:

fag2

Syllabification: fag

noun

North American informal , offensive
A male homosexual.

Origin

1920s: short for faggot.

Derivatives

faggy

adjective

Definition of fag in:

There are 3 definitions of fag in English:

fag3

Syllabification: fag

noun

British informal
A cigarette.
More example sentences
  • She won't let Alvin smoke his spliffs and fags inside any more.
  • ‘A fag is a cig,’ he rolled his eyes at her stupidity.
  • And then there was the time we went round the school with a note from Jenkins saying we were doing a study into the effects of cigarette smoke, and could we have some of your fags please sir/miss?

Origin

late 19th century: elliptically from fag end.

Definition of fag in: