Entering a place or situation without permission or unwanted, often disturbing others who were already there.
From Latin 'intrudere' (in- 'in' + trudere 'to thrust'), meaning to thrust oneself in. The meaning shifted from physical intrusion to unwanted presence in any context.
The word 'intrude' comes from the same Latin root as 'extrude'—both involve forceful movement, but in opposite directions. It's why intrusive thoughts feel like they're 'forcing' their way into your mind uninvited.
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