[xīn rú dāo jù]   

心    如    刀    锯    犹心如刀割。内心痛苦得象刀割一样。

心如刀锯，意思是犹心如刀割内心痛苦得象刀割一样

Feel as if a knife were piercing one's heart

心如刀割    心慕手追    心惊胆颤    心腹之交    心如悬旌