IPA: /ˈflɛrʌp/
KK: /flɛrʌp/
A sudden increase in intensity or severity, often referring to a medical condition or a conflict.
The patient experienced a flareup of his asthma after being exposed to dust.
Flareup is formed from "flare" (from Old English *flæran*, meaning to burn brightly or to blaze) and "up" (meaning to a higher position or level). The word describes a sudden increase in intensity or activity, often referring to a sudden worsening of a condition or situation.
Think of something that 'burns brightly' ('flare') and then 'rises' ('up') suddenly — that's why a flareup means a sudden increase in intensity.
No commonly confused words.