whack (wăk, hwăk)
v. whacked, whack·ing, whacks
1. To strike (someone or something) with a sharp blow; slap.
2. Slang To kill deliberately; murder.
To deal a sharp, resounding blow.
1. A sharp, swift blow.
2. The sound made by a sharp, swift blow.
whack off Vulgar SlangIdioms:
have/take a whack at Informal
To try out; attempt.
out of whack Informal
Improperly ordered or balanced; not functioning correctly.
whacked out Slang
3. Under the influence of a mind-altering drug.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2018 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.