Archaic past tense and past participle of engird or engirdle; wrapped or encircled.
From engird with an irregular past tense form (like 'girt' from 'gird'), this is an old strong verb form that's not used in modern English.
This is a relic of Old English strong verbs—gird/girt/girdled—where English verbs changed their vowel instead of adding -ed. We've almost entirely switched to regular -ed endings, so forms like 'engirt' sound like Shakespearean English now!
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