- to live in or overrun to an unwanted degree or in a troublesome manner, especially as predatory animals or vermin do: I had a major problem with cockroaches infesting my kitchen.The emerald ash borer has already infested many of the local ash trees.
- to be numerous in, as anything undesirable or troublesome: the cares that infest the day.
- to harass.
- to inhabit or overrun in dangerously or unpleasantly large numbers
- (of parasites such as lice) to invade and live on or in (a host)
