blood is up

idiom

Definition of blood is up

British
used to say that someone is angry and wants to fight or argueIt's best to avoid her when her blood is up.

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“Blood is up.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/blood%20is%20up. Accessed 14 Aug. 2020.

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