tr.v. con·cussed, con·cuss·ing, con·cuss·es
To injure by concussion: "a middle-aged woman concussed by a blow on the head" (Manchester Guardian Weekly).
[Latin concutere, concuss-, to strike together : com-, com- + quatere, to strike; see kwēt- in the Appendix of Indo-European roots.]
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 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.