a. The act or an instance of knocking down.
b. The condition of being knocked down.
2. An overwhelming blow or shock.
3. Something designed to be easily assembled or disassembled.
1. Strong enough to knock down or overwhelm; powerful: a knockdown blow.
2. Designed to be easily assembled or disassembled: knockdown furniture.
3. Reduced: knockdown prices.
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.