To explain something very clearly, especially something confusing or difficult. It often suggests adding detail or examples to make an idea easier to understand.
From Latin 'elucidare' meaning 'to make clear,' from 'e-' (out) + 'lucidus' (clear, bright), from 'lux' (light). Originally, it meant to shed light on something. English kept that metaphor of turning on the light in someone’s mind.
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