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march aggressively into another's territory by military force for the purposes of conquest and occupation;
"Hitler invaded Poland on September 1, 1939"
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to intrude upon, infringe, encroach on, violate;
"This new colleague invades my territory"
"The neighbors intrude on your privacy"
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occupy in large numbers or live on a host;
"the Kudzu plant infests much of the South and is spreading to the North"
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penetrate or assault, in a harmful or injurious way;
"The cancer had invaded her lungs"