to be etched in one's mind心に刻み付ける The scene of his ~ ing is still etched (ɛtʃt) in my mind. 彼が〜した光景は今でも心に焼き付いている。 The scene was etched in my mind.その情景は私の心に焼き付いていた.

talk behind someone's back 陰口を言う behind someone's backは、誰かに隠れて、または誰かに秘密にして何かをすること。 Stop talking about friends behind their backs. 友達の陰口を言うのはやめなさい。 Talking about others behind their back is a…