Definitions

1. verb

to stay longer than intended or expected, often without permission.

“The guests understay their welcome by helping themselves to leftovers.”

2. noun

a person who stays longer than intended or expected, especially in a hotel or other place of accommodation.

“The hotel manager was unhappy with the number of understay guests.”

3. noun

a period of time spent staying longer than intended or expected.

“The understay time was charged to the guest’s account.”