To fill with spirit or courage; to animate with enthusiasm, vigor, or divine inspiration.
From 'spirit' plus 'en-' prefix. 'Spirit' comes from Latin 'spiritus' (breath), related to 'spirare' (to breathe), making the word literally mean 'to fill with breath or life.'
The connection between 'spirit' and 'breathe' in Latin is preserved in modern English—to 'enspirit' someone is literally to fill them with breath/life, which is why we still say we're 'inspired' (in-spirited) when we get great ideas.
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