心如刀割的英文是「feel as if a knife were piercing one 's heart」
xin ru dao ge
内心痛苦得象刀割一样。
元·秦简夫《赵礼让肥》第一折:“待着些粗粝,眼睁睁俺子母各天涯,想起来我心如刀割。”