tr.v. thanked, thank·ing, thanks
1. To express gratitude to; give thanks to: He thanked her for the gift.
2. To hold responsible; credit: We can thank the parade for this traffic jam.
3. Used ironically in the future tense to express a rebuke: I'll thank you to keep quiet until the presentation is finished.
[Middle English thanken, from Old English thancian; see tong- 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.