Meaning of “fluster” in the English Dictionary

"fluster" in American English

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flusterverb [ T ]

us /ˈflʌs·tər/

to make someone nervous or upset, esp. when the person is trying to do something:

Don’t let that new tax form fluster you – it’s not as bad as it looks.
adjective us /ˈflʌs·tərd/

If I look flustered it’s because I’m trying to do 20 things at once.

(Definition of “fluster” from the Cambridge Academic Content Dictionary © Cambridge University Press)