ceñir
tighten
cinch
to tighten or secure firmly
+
-ir
verb suffix
Ceñir means to tighten and can be remembered as cinch0 (to tighten or secure firmly0) + -ir1 (verb suffix1).
verb
  1. tighten
    To tighten or fit closely around something
    Ella ciñó el cinturón alrededor de su cintura. // She tightened the belt around her waist.
  2. limit
    To limit or restrict
    Debemos ceñirnos al presupuesto asignado. // We must limit ourselves to the assigned budget.