D defs.my
Entry 1 sense Webster, 1913

Prepay

/prēp-ā'/ · Pre·pay · IPA /priːpˈeɪ/
01 v. t. To pay in advance, or beforehand; as, to prepay postage.
imp. & p. p. Prepaid; p. pr. & vb. n. Prepaying
  1. 1.
    To pay in advance, or beforehand; as, to prepay postage.