rag (ræɡ)
vb (tr) , rags, ragging or ragged
1. to draw attention facetiously and persistently to the shortcomings or alleged shortcomings of (a person)
2. Brit to play rough practical jokes on
n
3. Brit a boisterous practical joke, esp one on a fellow student
4. (Education) (in British universities)
a. a period, usually a week, in which various events are organized to raise money for charity, including a procession of decorated floats and tableaux
b. (as modifier): rag day.
[C18: of uncertain origin]