Usually means: Sudden worsening of a condition.
Definitions Related words Mentions Lyrics Colors (New!)
We found 28 dictionaries that define the word flare-up:

General (22 matching dictionaries)
  1. flare-up: Merriam-Webster
  2. flare-up: Oxford Learner's Dictionaries
  3. flare-up: American Heritage Dictionary of the English Language
  4. flare-up, flare-up: Collins English Dictionary
  5. flare-up: Vocabulary.com
  6. flare-up: Wordnik
  7. flare-up: Cambridge Advanced Learner's Dictionary
  8. flare-up: Wiktionary
  9. flare-up: Webster's New World College Dictionary, 4th Ed.
  10. flare-up: The Wordsmyth English Dictionary-Thesaurus
  11. flare-up: Dictionary.com
  12. Flare-up: Wikipedia, the Free Encyclopedia
  13. Flare-up: Online Plain Text English Dictionary
  14. flare-up: Webster's Revised Unabridged, 1913 Edition
  15. flare-up: Rhymezone
  16. Flare-up: AllWords.com Multi-Lingual Dictionary
  17. Flare-up, Flare-up: Dictionary of Phrase and Fable (1898)
  18. flare-up: FreeDictionary.org
  19. flare-up: Mnemonic Dictionary
  20. flare-up: TheFreeDictionary.com

Business (1 matching dictionary)
  1. flare-up: Legal dictionary

Computing (1 matching dictionary)
  1. flare-up: Encyclopedia

Medicine (3 matching dictionaries)
  1. flare-up: Merriam-Webster Medical Dictionary
  2. flare-up: Medical dictionary
  3. Inflammatory Bowel Disease Glossary (No longer online)

Slang (1 matching dictionary)
  1. flare-up, flare-up, flare-up: Green’s Dictionary of Slang

(Note: See flare-ups as well.)

Google, News, Images, Wikipedia, Reddit, BlueSky
Definitions from Wiktionary (flare-up)

▸ noun:  A sudden outbreak, outburst or eruption (originally of flame, but now used more generally of any violent activity or emotion).
▸ noun:  A sudden intensification in activity.
▸ noun:  An inflammation such as of tendons (tendonitis) or joints (osteoarthritis).

Similar:
outburst, burst, flare, outbreak, blaze-up, upbreak, breakout, flareback, blowup, flashing, more...

Types:
heart attack, stroke, asthma attack, allergic reaction, anaphylactic shock, epileptic seizure, panic attack, more...

Colors:
    red,     orange,     yellow,     scarlet,     crimson, more...



▸ Words similar to flare-up

▸ Usage examples for flare-up

▸ Idioms related to flare-up

▸ Wikipedia articles (New!)

▸ Popular adjectives describing flare-up

▸ Words that often appear near flare-up

▸ Rhymes of flare-up

▸ Invented words related to flare-up

Similar:
outburst, burst, flare, outbreak, blaze-up, upbreak, breakout, flareback, blowup, flashing, more...

Types:
heart attack, stroke, asthma attack, allergic reaction, anaphylactic shock, epileptic seizure, panic attack, more...

Colors:
    red,     orange,     yellow,     scarlet,     crimson, more...



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