yāsaf יָסַף ‘to add’ (Hebrew)

Etymology^?: a primitive root

yāsaf v
1) to add, increase, do again
 1a) (Qal) to add, increase, do again
 1b) (Niphal)
  1b1) to join, join oneself to
  1b2) to be joined, be added to
 1c) (Hiphil)
  1c1) to cause to add, increase
  1c2) to do more, do again