In a dancing manner; with movement that resembles or suggests dancing.
From 'dance' plus the present participle '-ing' plus the adverbial suffix '-ly' (from Old English), creating an adverb that describes how something happens like a dance.
Adverbs ending in '-ingly' are almost always adjectives or verbs turned into descriptions—'dancingly' is rarely used today, but it beautifully captures how a flame, leaf, or light might move!
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