Fluster definitions

flŭs'tər
A state of agitation, confusion, or excitement.
noun
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The condition of being flustered.
noun
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To make or become nervous or upset.
verb
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To make or become confused, nervous, or befuddled.
verb
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To fluster is defined as to make someone become agitated, nervous or confused.

When you ask a person questions he doesn't understand and he gets nervous, this is an example of a time when you fluster him.

verb
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(dated) To make hot and rosy, as with drinking.
verb
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(by extension) To confuse, befuddle, throw into panic by making overwrought with confusion.

He seemed to get flustered when speaking in front of too many people.

verb
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(intransitive) To be in a heat or bustle; to be agitated and confused.
verb
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Origin of fluster

From Middle English flostring agitation probably of Scandinavian origin pleu- in Indo-European roots