v. o·ver·turned, o·ver·turn·ing, o·ver·turns
a. To cause to turn over; upset or flip over: Large waves overturned the raft.
b. To cause to fall over; knock or topple over: bumped the vase and overturned it.
c. To ransack: found that the room had been overturned during the night.
To turn over or capsize: The car went off the road and overturned.
1. The act or process of overturning: the court's overturn of a ruling.
2. The state of having been overturned.
3. The periodic mixing or circulation of water in a lake or sea as a result of changing temperature of its layers.
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.