Brown Driver Briggs

 1. to conceal, hide, be hidden, be concealed, be secret
  1) (Qal) secret (participle)
  2) (Niphal)
1b1. to be concealed
1b2. concealed, dissembler (participle)
  3) (Hiphil) to conceal, hide
  4) (Hithpael) to hide oneself