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    出尔反尔 出爾反爾

    chūěrfǎněr

    1. old: to reap the consequences of one's words (idiom, from Mencius); modern: to go back on one's word; to blow hot and cold; to contradict oneself; inconsistent

    他说过要帮我,现在却说没时间,真是出尔反尔。 Tā shuōguò yào bāng wǒ, xiànzài què shuō méi shíjiān, zhēnshi chūěrfǎněr.