one's back is up

短语
中文释义

英文释义

短语
  1. One is offended or angry. idiomatic
    — 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.

词源

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