Idiom Breakdown

one's back is up

English sentences

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Definition

One is offended or angry.

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From the way a cat, when angry, raises or arches its back.

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"My back is up, and I cannot hear the thought of wooing him any farther, nor would do it, though he were as pig a gentleman (look you) as Lucifer himself."
"And I want you to be nice to Patty. For some reason her back is up."
"Now my back is up. “Yes, the witch,” I hiss."

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