We found 15 dictionaries that define the word post haste:

General (11 matching dictionaries)

1. post haste: Longman Dictionary of Contemporary English
2. post-haste: Vocabulary.com
3. post-haste: Wordnik
4. post-haste, post haste: Wiktionary
5. post-haste: Dictionary.com
6. Post haste: Wikipedia, the Free Encyclopedia
7. post-haste: Rhymezone
8. post-haste: Webster's 1828 Dictionary
9. post-haste: FreeDictionary.org
10. post-haste: Mnemonic Dictionary
11. post-haste: TheFreeDictionary.com

Art (1 matching dictionary)

12. Glossary of Stamp Collecting Terms (No longer online)

Business (1 matching dictionary)

13. BusinessDictionary.com (No longer online)

Miscellaneous (1 matching dictionary)

14. post-haste: Idioms

Slang (1 matching dictionary)

15. Post-Haste, The Post-Haste: Urban Dictionary

Definitions from Wiktionary (Post haste) ▸ adverb:  Alternative form of posthaste [Quickly, as fast as someone travelling post; with great speed.] Similar: poste-haste, ASAP, quick smart, quickhanded, hurry-scurry, ad-hoc, flat-out, all of the sudden, swithe, all the sudden, more... Opposite: leisurely, slowly, unhurried, at leisurely pace Types: quickly, promptly, expeditiously, swiftly, speedily, rapidly, more... Adjectives: hasty, sudden, rapid, precipitated, rank, drive-by, rushed, crash, rathe, headlong, cursory ▸ Words similar to post haste ▸ Usage examples for post haste ▸ Idioms related to post haste ▸ Wikipedia articles (New!) ▸ Words that often appear near post haste ▸ Rhymes of post haste ▸ Invented words related to post haste