In a manner that flashes or shines brightly; with sudden bright light or gleaming appearance.
Formed from 'flash' (verb) + '-ing' (present participle) + '-ly' (adverbial suffix), describing an action performed with flashing quality.
Words like 'flashingly' show how English loves to layer suffixes—we can keep adding grammatical pieces to create words that might not be in the dictionary but are perfectly understandable.
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