Entered a place without permission or interrupted someone uninvitedly; came in where not wanted.
From Latin 'intrudere' combining 'in-' (into) and 'trudere' (to thrust or push). The '-ed' makes it past tense, showing something was thrust in unwantedly.
In geology, 'intrusion' happens when hot magma forces itself into existing rock layers—using the same 'thrusting in' principle as the word's original meaning!
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