You said:
Of a word or words, to lose the full subtlety of meaning or significance when translated from one language to another, especially when done literally. My friend tried explaining a few French idioms to me, but I'm afraid they got lost in translation.
into Japanese
言葉や言葉の中で、特に文字通りに行われたときに、ある言語から別の言語に翻訳されたときに意味や意義の完全な微妙さを失うこと。私の友人は私にいくつかのフランス語のイディオムを説明しようとしましたが、翻訳に迷ってしまいました。
Back into English
When translated into another language from one language or words in particular literally when to lose the full subtlety of meaning and significance. My friend tried to explain the idiom of France, some of me is lost in translation.