ʿārav עָרַב ‘to pledge’ (Hebrew)

Etymology^?: a primitive root

ʿārav v
1) to pledge, exchange, mortgage, engage, occupy, undertake for, give pledges, be or become surety, take on pledge, give in pledge
 1a) (Qal)
  1a1) to take on pledge, go surety for
  1a2) to give in pledge
  1a3) to exchange
  1a4) to pledge
 1b) (Hithpael)
  1b1) to exchange pledges
  1b2) to have fellowship with, share