1. A leather-covered bludgeon used as a hand weapon, having a short, flexible shaft or strap from which it is swung.
2. Games A card game in which the object is to accumulate cards with a higher count than that of the dealer but not exceeding 21. Also called twenty-one, vingt-et-un.
tr.v. black·jacked, black·jack·ing, black·jacks
1. To hit or beat with a blackjack.
2. To coerce by threats.
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.