FagFAG, verb transitive To beat. [Not in use.]FAG, noun A slave; one who works hard. [Not in use.]FAG, verb intransitive [Heb. to fail, to languish.]To become weary; to fail in strength; to be faint with weariness.The Italian began to fag[A vulgar word.]FAG, noun A knot in cloth. [Not in use.]