sobrar
to be left over
sobre
over
+
-ar
verb suffix
Sobrar means to be left over and can be thought of as sobre0 (over0) + -ar1 (verb1), implying something is 'over' or in excess.
verb
  1. to be left over
    To be left over, to be in excess
    Siempre sobra comida después de las fiestas. // There's always food left over after parties.