invade

(verb) march aggressively into another's territory by military force for the purposes of conquest and occupation. Synonyms: occupy. Example: "Hitler invaded poland on september 1, 1939."

(verb) to intrude upon, infringe, encroach on, violate. Synonyms: intrude on, obtrude upon, encroach upon. Examples: "This new colleague invades my territory." "The neighbors intrude on your privacy."

(verb) occupy in large numbers or live on a host. Synonyms: overrun, infest. Example: "The kudzu plant infests much of the south and is spreading to the north."

(verb) penetrate or assault, in a harmful or injurious way. Example: "The cancer had invaded her lungs."