infest in WordNet English dictionary

1. invade in great numbers
   "the roaches infested our kitchen"
   infest  overrun 
   
2. live on or in a host, as of parasites
   infest 
   
3. occupy in large numbers or live on a host
   "the Kudzu plant infests much of the South and is spreading to the North"
   invade  overrun  infest