infestation
🇺🇸
/ˌɪnfeˈsteɪʃn/
🇬🇧
/ˌɪnfeˈsteɪʃn/
When there are a lot of unwanted creatures, like bugs or rats, living somewhere and causing problems.
The house had an infestation of mice, which was a big problem.
房屋里有老鼠的侵扰,这是一个大问题。