slice something off
phrasal verb with slice verb uk/slaɪs/ us/slaɪs/
切下，切除
to remove an amount of something by cutting it
She sliced off a piece of sausage. 她切下了一段香肠。
He accidentally sliced the top off his finger while he was cutting vegetables. 他切菜时不小心削掉了手指尖。
figurative Amit won the race, slicing three seconds off his previous best time. 阿米特赢得了赛跑，将他的最好成绩缩短了3秒。