In a manner characteristic of filching; in a sneaky or stealthy way related to stealing small items.
From 'filching' (present participle of 'filch') with the adverb suffix '-ly.' This rare form appears in older literature to describe actions done in the manner of filching.
This adverb is rarely used but appears in 19th-century literature to describe characters moving 'filchingly' through rooms—the word itself captures the sneaky, guilty way someone moves when stealing something.
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