1. A block or wedge placed under something else, such as a wheel, to keep it from moving.
2. Nautical A heavy fitting of metal or wood with two jaws curving inward, through which a rope or cable may be run.
tr.v. chocked, chock·ing, chocks
1. To fit with or secure by a chock: The plane's wheels were chocked and chained down.
2. Nautical To place (a boat) on blocks or wedges.
As close as possible: had to stand chock up against the railing.
[Possibly from Old North French choque, log, from Gaulish *tsukka, stump, of Germanic origin.]
(click for a larger image)chock
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.