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Classic usage
Estimated CEFR level: C2 — Proficiency
Estimated from word frequency; not an official CEFR classification.
The verb is probably from Middle English *flostren (implied in flostring, flostrynge (“agitation; blustering”)) from a Scandinavian (North Germanic) language; compare Icelandic flaustra (“to bustle”), flaustr (“a bustle; a hurry”). Compare Old English flustrian (“to weave, plait, braid”). The noun is derived from the verb.
perturbation
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Classic usage
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Verbault — Brown corpus levels, WordNet definitions, Gutenberg corpus.
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