flatten definition by Webster's New World
- to make flat or flatter
- Informal to knock down; make prostrate
- to level to the ground
- to become flat or flatter
- to become prostrate
Webster's New World College Dictionary Copyright © 2010 by Wiley Publishing, Inc., Cleveland, Ohio. Used by arrangement with John Wiley & Sons, Inc.
- flattener noun
flatten definition by American Heritage Dictionary
The American Heritage® Dictionary of the English Language, 4th edition Copyright © 2010 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
verb flat·tened, flat·ten·ing, flat·tens verb, transitive
- To make flat or flatter.
- To knock down; lay low: The boxer was flattened with one punch.
To become flat or flatter.
- flatˈten·er noun