saldar
settle
saldo
balance
+
-ar
verb suffix
Saldar means to settle and can be thought of as saldo0 (balance0) + -ar1 (verb suffix1), implying the action of settling a balance.
verb
  1. settle
    To settle or pay off a debt or account
    Necesito saldar mi deuda con el banco. // I need to settle my debt with the bank.