v. flus·tered, flus·ter·ing, flus·ters
To make agitated, excited, or confused: Shouts from the protesters flustered the speaker. I was flustered by my teacher's comments and began to stumble over my words.
To become agitated, excited, or confused: a shy student who flusters easily.
A state of agitation, excitement, or confusion: The heavy traffic put the driver in a fluster.
[From Middle English flostring, agitation, probably of Scandinavian origin; see pleu- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2019 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.