a. A sudden rupture or bursting, as of an automobile tire.
b. The hole made by such a rupture.
2. A sudden escape of a confined gas or liquid, as from a well.
a. A large party or other social affair: "Lunch was a billion-calorie blowout beside the pool" (Vanity Fair).
b. A lopsided victory or thorough defeat.
c. A sale in which the discounts are unusually large.
4. A treatment, as at a beauty salon, in which the hair is washed, blown dry, and styled without being cut.
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.