If you say that a place is overrun with things that you consider undesirable, you mean that there are a large number of them there.
The hotel has been ordered to close because it is overrun by mice and rats.
这家旅馆因为老鼠泛滥成灾而被勒令关闭了。
overruns , overrunning , overran
If an army or an armed force overruns a place, area, or country, it succeeds in occupying it very quickly.
A group of rebels overran the port area and most of the northern suburbs.
一群叛乱分子迅速占领了港口地区和大部分北部郊区。
If an event or meeting overruns by, for example, ten minutes, it continues for ten minutes longer than it was intended to.
run over
If costs overrun, they are higher than was planned or expected.
We should stop the nonsense of taxpayers trying to finance joint weapons whose costs always overrun hugely.
联合武器开发的费用总是大大超支,而纳税人还要设法出钱资助,我们应该制止他们这种荒唐的行为。
Costs overran the budget by about 30.
花费超出了预算约30%。