[noun] [U] UK - people who move out of a city because there are too many people living in it and into other towns or villages near the cityHarlow New Town was designed to accommodate the overspill from London/the London overspill.They live on an overspill housing estate.
OVERSPILL
Meaning of OVERSPILL in English
Cambridge English vocab. Кембриджский английский словарь. 2012