n. pl. say-sos
1. An unsupported statement or assurance: I'm not reporting him just on your say-so.
2. An expression of permission or approval: If you want to borrow the bike, you have to get her say-so.
3. The right or authority to decide: Do I have any say-so in this matter?
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.