‘侵入’ is a verb meaning ‘to invade’ or ‘to infiltrate’, describing the act of entering a space, system, or domain forcibly, secretly, or without permission. The first character 侵 (qīn) means ‘to encroach upon’ or ‘to violate’, often implying aggression or threat; the second character 入 (rù) means ‘to enter’. Together, they emphasize unauthorized, often harmful entry — whether by foreign forces into territory, pathogens into the body, or malware into a computer system.

This word is commonly used in formal, technical, or journalistic contexts — especially in medicine (e.g., bacterial invasion of tissues), cybersecurity, military reporting, and ecology (e.g., invasive species). It carries a distinctly negative connotation and rarely appears in casual speech. Unlike simpler verbs like 进入 (to enter), 侵入 implies violation, danger, or disruption, making it unsuitable for neutral or positive situations like ‘entering a room’ or ‘joining a club’.