In a manner that girdling or encircles; in a way that resembles girdling.
From girdling + -ly (adverbial suffix), created by adding the standard adverb-forming suffix to the present participle girdling.
This is a beautifully rare adverb—it probably never appears in modern writing, but it shows how English speakers of the past could theoretically describe any action in adverbial form using productive grammar rules.
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