IPA: /ˌoʊvərˈsteɪ/
KK: /oʊvərˈsteɪ/
To remain in a place longer than allowed or expected.
The guests overstayed their welcome and made the host uncomfortable.
Past: overstayed
Past Participle: overstayed
Overstay → It is formed from "over-" (meaning excessively or beyond) and "stay" (from Old English "stægan", meaning to remain or to continue). The word "overstay" means to remain beyond the expected or allowed time.
Think of staying 'beyond' ('over-') the time you are supposed to be there — that's why overstay means to stay too long.