blood is up
phrase
British
—used to say that someone is angry and wants to fight or argue
It's best to avoid her when her blood is up.
Cite this Entry
“Blood is up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blood%20is%20up. Accessed 15 Mar. 2026.
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Merriam-Webster unabridged
