Definition: invade in great numbers
Usage: the roaches infested our kitchen
Definition: march aggressively into another's territory by military force for the purposes of conquest and occupation
Usage: Hitler invaded Poland on September 1, 1939
Synonyms: infest
Definition: live on or in a host, as of parasites
Synonyms: infest, invade, overrun
Definition: occupy in large numbers or live on a host
Usage: the Kudzu plant infests much of the South and is spreading to the North