See more synonyms for flareup on Thesaurus.com
  1. a sudden flaring up of flame or light.
  2. a sudden outburst or intensification, as of anger or tensions.
  3. a sudden outbreak of violence, disease, or any other condition thought to be quelled, checked, or inactive.

Origin of flareup

First recorded in 1830–40; noun use of verb phrase flare up
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for flareup

Historical Examples of flareup