Etymology
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fluster (v.)

early 15c. (implied in flostrynge), "bluster, agitate," probably from a Scandinavian source (compare Icelandic flaustr "bustle," flaustra "to bustle"), from Proto-Germanic *flaustra-, probably from PIE *pleud-, extended form of root *pleu- "to flow." Originally "to excite," especially with drink; sense of "to flurry, confuse" is from 1724. Related: Flustered; flustering; flustery. As a noun, 1710, from the verb.

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Definitions of fluster
1
fluster (v.)
be flustered; behave in a confused manner;
fluster (v.)
cause to be nervous or upset;
2
fluster (n.)
a disposition that is confused or nervous and upset;
Synonyms: perturbation
From wordnet.princeton.edu