Meaning

noun the relocation of people from overcrowded cities; they are accommodated in new houses or apartments in smaller towns

noun the occurrence of surplus liquid (as water) exceeding the limit or capacity

originEtymology tree Proto-Indo-European *úp Proto-Indo-European *-er Proto-Indo-European *upér Proto-Germanic *uber Old English ofer- Middle English over- English over- English spill English overspill From over- + spill.

Etymology from Wiktionary, CC BY-SA 3.0