cumplir
fulfill
complete
to finish or make whole
+
-ir
verb suffix
Cumplir means to fulfill and can be remembered by thinking of complete0 (to finish or make whole0) + -ir1 (verb suffix1), as fulfilling something means completing it.
verb
  1. fulfill
    To fulfill or carry out a duty, promise, or requirement
    Debemos cumplir con nuestras responsabilidades. // We must fulfill our responsibilities.