Brown Driver Briggs

 1. to purify, select, polish, choose, purge, cleanse or make bright,
test or prove
  1) (Qal)
1a1. to purge, purge out, purify
1a2. to choose, select
1a3. to cleanse, make shining, polish
1a4. to test, prove
  2) (Niphal) to purify oneself
  3) (Piel) to purify
  4) (Hiphil)
1d1. to purify
1d2. to polish arrows
  5) (Hithpael)
1e1. to purify oneself
1e2. to show oneself pure, just, kind