To get involved in something that is not your business, or to create a disturbance that prevents something from working properly.
From Latin 'inter-' (between) and Old French 'ferre' (to strike or hit). Originally meant 'to strike against,' evolved to mean 'getting in the way of' or 'obstruct.'
In physics, 'interference' is when waves overlap and create patterns—the word was borrowed for human behavior because both describe something disrupting a smooth, intended path, which is why the metaphor works so perfectly!
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