overspill

That which spills over.

New towns were constructed to accommodate overspill from established cities.

It is known that means of using this end of the former NLR and Broad Street station to take an overspill of traffic from Liverpool Street have been under backroom study for some time.

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

Further, Coventry's prosperity and rapid growth was threatening that it as well as Birmingham would require to overspill its boundaries.

Calandra added more, until the oil threatened to overspill her palm.