People who enter a place where they should not be or are not wanted, often unwelcome or uninvited.
From Latin intrudere, combining 'in-' (in) and 'trudere' (to thrust or push). The word literally means 'to thrust in,' and evolved to describe anyone pushing their way in where they don't belong.
The word 'intrude' comes from the idea of physically pushing in, which is why intruders feel so threatening—they're literally forcing themselves into your space. This physical root word makes the violation feel real, not just abstract.
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