an·tiph·ra·sis /ænˈtɪfrəsəs/
反用法
An·tiph·ra·sis n. Rhet. The use of words in a sense opposite to their proper meaning; as when a court of justice is called a court of vengeance.
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antiphrasis
n : the use of a word in a sense opposite to its normal sense
(especially in irony)