antiphrasis
n.
1530s, from Latin antiphrasis, from Greek antiphrasis, from antiphrazein "to express (something) by the opposite," from anti- (see anti-) + phrazein "to consider, to express" (see phrase, n.).
〔李〕[anti-;phras;-isn.] n.反话法； 词义反用法 ←phras (GK phrazein)=to speak 说