bāṣar בָּצַר ‘to gather/restrain/fortify’ (Hebrew)

Etymology^?: a primitive root

bāṣar v
1) to gather, restrain, fence, fortify, make inaccessible, enclose
 1a) (Qal)
  1a1) to cut off
  1a2) fortified, cut off, made inaccessible (pass participle)
  1a3) secrets, mysteries, inaccessible things (subst)
 1b) (Niphal) to be withheld
 1c) (Piel) to fortify