The Collaborative International Dictionary of English v.0.48:

Rag \Rag\ (r[a^]g), v. i. [imp. & p. p. Ragged (r[a^]gd); p.
   pr. & vb. n. Ragging (r[a^]g"g[i^]ng).]
   To become tattered. [Obs.]
   [1913 Webster]