心如刀割

xīnrúdāogē
  1. to feel as if having one's heart cut out (idiom)
  2. to be torn with grief

CEDICT

to be heartbroken

Wiktionary

内心痛苦像被刀割一样。元．秦{[90ba]}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，题起来我泪似悬麻。」《三国演义．第二三回》：「操怒教打。身上无容刑之处，承在座观之，心如刀割。」也作「心如刀绞」、「心如刀搅」、「心如刀锯」、「心如刀剉」。

重編國語辭典

内心的痛苦感受

維基詞典

Entry Composition

1 心 xīn
  1. heart
  2. mind
  3. intention
  4. center
  5. core

classifiers: 顆, 個
2 如 rú
  1. as
  2. as if
  3. such as
3 刀 dāo
  1. (slang) (loanword) dollar
  2. classifier for sets of one hundred sheets (of paper)
  3. classifier for knife cuts or stabs
  4. (Internet slang) to bargain; to ask for a small discount (esp. on second-hand marketplaces)

classifier: 把
4 割 gē
  1. to cut
  2. to cut apart