IPA: /ˈspɪlˌoʊvər/
KK: /ˈspɪlˌoʊvər/
An extra amount that has spilled over from one place to another, often used to describe unintended consequences or effects that result from a situation.
The spillover from the busy conference filled the nearby hotel with guests.
Spillover → It is formed from "spill" (from Old English "spillan", meaning to cause to flow or fall) and "over" (meaning above or across). The word "spillover" refers to the act of something flowing over the edge or beyond its limits.
Think of something that 'flows' ('spill') 'across' ('over') its boundaries — that's what spillover means.