To insert or place something between two other things, or to intervene in a situation. It involves putting oneself or something in the middle of a situation.
From Latin 'inter-' (between) + 'ponere' (to place) → 'interponere' meaning 'to place between.' The word maintained this spatial meaning through Old French and into Middle English, where it developed both physical and metaphorical uses of placing something in the middle.
When you 'interpose' yourself in an argument, you're literally placing yourself between the conflicting parties! This word beautifully preserves the physical sense of its Latin roots - just like 'interpolate' (placing between data points) and 'interpret' (placing meaning between languages).
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