Verb

To thoroughly confuse, befuddle, or bewilder.

*

, title=(The Celebrity), chapter=2 , passage=I had occasion […] to make a somewhat long business trip to Chicago, and on my return […] I found Farrar awaiting me in the railway station. He smiled his wonted fraction by way of greeting, […], and finally leading me to his buggy, turned and drove out of town. I was completely mystified at such an unusual proceeding.}}

Verb

(dated) To make hot and rosy, as with drinking.

* Macaulay

His habit of flustering himself daily with claret.

(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.

To be in a heat or bustle; to be agitated and confused.

* South

The flustering , vainglorious Greeks.