Language: en
Meaning: (idiomatic)One is offended or angry.1835, William Hayley,The Life and Letters of William Cowper: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.2011, Jeannie Watt,The Baby Truce,→ISBN, page84:And I want you to be nice to Patty. For some reasonher back is up.2014, Kristin Butcher,Cabin Girl,→ISBN:Nowmy back is up. “Yes, the witch,” I hiss.
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Sourced from Wiktionary