ʿālam עָלַם ‘to conceal’ (Hebrew)

Etymology^?: a primitive root

ʿālam v
1) to conceal, hide, be hidden, be concealed, be secret
 1a) (Qal) secret (participle)
 1b) (Niphal)
  1b1) to be concealed
  1b2) concealed, dissembler (participle)
 1c) (Hiphil) to conceal, hide
 1d) (Hithpael) to hide oneself