overspill

/OW1 V ER0 S P IH0 L/
noun
  1. 1

    That which spills over.

    โ€œNew towns were constructed to accommodate overspill from established cities.โ€

verb
  1. 1

    To spill over, to overflow, to spill out of.

Source: https://en.wiktionary.org/wiki/overspill