In a curly or spiral manner; with curls or twists.
From 'curly' (adjective meaning having curls) plus '-ly' (adverb-forming suffix), creating an adverb that describes how something is done in a curled fashion.
The '-ly' suffix is one of English's most productive grammar tools—you can add it to almost any adjective to turn it into an adverb describing how an action happens, which is why adverbs like this are so easy for speakers to invent.
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