To make like a horse; to give equine characteristics to something, used rarely in literary or technical contexts.
From Latin 'equinus' (horse-like) plus the English verbal suffix '-ate' (to cause to be). A very rare word, it appears occasionally in older philosophical or rhetorical texts.
This is a delightfully odd word—'equinate the problem' would theoretically mean to give a problem horse-like qualities, which is the kind of poetic nonsense that appears in medieval philosophical debates.
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