invade
verb
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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”occupy
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penetrate or assault, in a harmful or injurious way“The virus invaded the patient's lungs.”
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to intrude upon, infringe, encroach on, violate“This new colleague invades my territory”intrude onobtrude uponencroach upon
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occupy in large numbers or live on a hostoverrun