# flare-up

> English word · Noun

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

## Etymology
Deverbal from flare up.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/flare-up