In a forked manner; with a branching or split pattern; in a way that divides into separate parts.
From 'forked' (adjective form of 'fork' meaning having a fork-like shape) plus the adverbial suffix '-ly' meaning 'in the manner of.'
This adverb is rare in modern English, but it captures the precise image of something moving or proceeding in multiple directions simultaneously—like how lightning travels forkedly through the sky.
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