動詞 infest:

1. invade in great numbers
   同義詞：overrun
2. occupy in large numbers or live on a host
   同義詞：invade, overrun
3. live on or in a host, as of parasites

1. There is a warehouse infested by rats.
   那有一個大批老鼠出沒的倉庫。
2. It's a garden infested with weeds.
   這是雜草叢生的花園。

in.fest

v.tr.（及物動詞）
in.fest.ed,in.fest.ing,in.fests
To inhabit or overrun in numbers large enough to be harmful, threatening, or obnoxious:
（害蟲、盜賊等）大批出沒于：大量地居住或出沒于，數(shù)量大到有害、有威脅性或有毒的程度：
例句：
rats infesting the sewers; streets that were infested with drugs.
老鼠大量出沒于下水道；大街上毒品泛濫

To live as a parasite in or on tissues or organs or on the skin and its appendages:
寄生于：在組織內、器官上、皮膚上和體表器官上象寄生蟲一樣生存：
例句：
livestock that were infested with tapeworms.
寄生了大量絳蟲的動物

來源：
Middle English infesten [to distress]
中古英語 infesten [折磨]
from Old French infester
源自 古法語 infester
from Latin onfest3re
源自 拉丁語 onfest3re
from onfestus [hostile] * see g whedh-
源自 onfestus [敵意的] *參見 g whedh-

【引伸】
in.festa.tion
n.（名詞）
infest.er
n.（名詞）