unpay1
/(ˌ)ʌnˈpeɪ/Now rare
verb
[with object] To refuse or fail to pay (a debt, charge, etc.). Formerly also with person as object. Chiefly Scottish in earlier use.
Origin
Middle English (in an earlier sense). From un- + pay.
unpay2
/(ˌ)ʌnˈpeɪ/verb
[with object] To reverse the payment of (a debt, charge, etc.); to render or consider unpaid.
Origin
Early 17th century (in an earlier sense). From un- + pay.