v. clacked, clack·ing, clacks
1. To make an abrupt, sharp sound, as in the collision of two hard surfaces.
2. To chatter thoughtlessly or at length.
3. To cackle or cluck, as a hen.
To cause to make an abrupt, sharp sound.
1. A clacking sound: the clack of an old-fashioned typewriter.
2. Something that makes a clacking sound.
3. Thoughtless, prolonged talk; chatter.
[Middle English clakken, from Old Norse klaka, of imitative origin.]
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.