1
: a sudden outburst or intensification
a flare-up of hostilities
2
: a sudden bursting (as of a smoldering fire) into flame or light
a danger of flare-ups
3
: a sudden appearance or worsening of the symptoms of a disease or condition
an asthmatic flare-up
Examples of flare-up in a Sentence
took medication to prevent a flare-up of her asthma
there's no need for an angry flare-up, as we'll take care of the problem immediately
Recent Examples on the Web
But when relationship stress mixes with work stress, financial angst, and family flare-ups, little squabbles can morph into damaging arguments.
—
Kelley J. Brower, CNBC, 5 June 2025
Consider azathioprine, a small molecule drug that helps women with lupus control painful and dangerous flare-ups.
—Christine Brennan, Boston Herald, 31 May 2025
Macron and Hegseth are among the world leaders, diplomats and top defense officials in Singapore this weekend for the region's biggest security forum that comes amid concerns of China's growing assertiveness, the global impact of the Russia-Ukraine war and the flare-up of conflicts in Asia.
—David Rising, Arkansas Online, 31 May 2025
Macron and Hegseth are among the world leaders, diplomats and top defense officials in Singapore this weekend for the region’s biggest security forum that comes amid concerns of China’s growing assertiveness, the global impact of the Russia-Ukraine war and the flare-up of conflicts in Asia.
—David Rising, Los Angeles Times, 30 May 2025
See All Example Sentences for flare-up
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Kelley J. Brower, CNBC, 5 June 2025
Consider azathioprine, a small molecule drug that helps women with lupus control painful and dangerous flare-ups.
—Christine Brennan, Boston Herald, 31 May 2025
Macron and Hegseth are among the world leaders, diplomats and top defense officials in Singapore this weekend for the region's biggest security forum that comes amid concerns of China's growing assertiveness, the global impact of the Russia-Ukraine war and the flare-up of conflicts in Asia.
—David Rising, Arkansas Online, 31 May 2025
Macron and Hegseth are among the world leaders, diplomats and top defense officials in Singapore this weekend for the region’s biggest security forum that comes amid concerns of China’s growing assertiveness, the global impact of the Russia-Ukraine war and the flare-up of conflicts in Asia.
—David Rising, Los Angeles Times, 30 May 2025
See All Example Sentences for flare-up
Cite this Entry
“Flare-up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/flare-up. Accessed 11 Jun. 2025.
Copy CitationMedical Definition
flare-up
noun
: a sudden appearance or worsening of the symptoms of a disease or condition
an asthmatic flare-up
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