In a manner that involves or makes a loud crashing sound; with a dramatic, forceful impact.
From crash (to collide with violent noise) with the gerundial suffix -ing and the adverbial suffix -ly. The root 'crash' is imitative, meant to evoke the sound of collision or breaking.
The '-ingly' suffix is less common than '-ly' but creates vivid adverbs—'crashingly,' 'strikingly,' 'charmingly' all suggest manner with added emphasis. It's like English wanted to squeeze extra intensity into the word.
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