Lewis & Short

purgĭto, āre, v. freq. a. [purgo], to cleanse, purify, purge (Plautin.).

  1. * I. Lit.: carnificis angiporta purgitans, Plaut. Fragm. ap. Non. 190, 10.
  2. * II. Trop., to excuse one’s self, Plaut. Aul. 4, 10, 23.