1. The jaws.
a. The mouth.
b. The lower cheeks or jowls.
3. Slang The technical skill with which a jazz or rock musician performs.
bust (someone's) chops
1. To scold or insult someone.
2. To disappoint or defeat someone.
3. To hold a building contractor to the letter of an agreement.
[Possibly akin to CHOP1. N. 3, originally in reference to the embouchure of trumpeters.]
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.