/ ˌɒksɪˈmɔːrɒn; NAmE ˌɑːksɪˈmɔːrɑːn/ noun
( technical ) a phrase that combines two words that seem to be the opposite of each other, for example a deafening silence
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WORD ORIGIN
mid 17th cent.: from Greek oxumōron , neuter (used as a noun) of oxumōros pointedly foolish, from oxus sharp + mōros foolish.