in heat
idiom
—used to describe a female animal that is ready to have sex and is able to become pregnant
The cat is in heat.
like a dog in heat
an animal that is coming into heat
Cite this Entry
“In heat.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/in%20heat. Accessed 30 Oct. 2025.
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Merriam-Webster unabridged
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