Third-person singular or plural of 'grue'; shudders with fear or horror; or things that are gruesome or frightful.
From Old English 'gruwan' (to shudder). The 's' form can be either verb conjugation (he/she grues) or plural noun (multiple grues = horrors).
Old English 'grue' shows how physical sensations and emotions were once more connected in language—you didn't just *feel* fear, your body literally 'grued' in response, showing the visceral nature of medieval emotion words!
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