descontar
deduct
discount
reduce in price or amount
+
-ar
verb suffix
Descontar means to deduct and can be thought of as the English word discount0 + -ar1 (verb suffix1).
verb
  1. deduct
    To deduct or subtract an amount from a total
    El banco va a descontar el pago mensual de tu cuenta. // The bank will deduct the monthly payment from your account.