Definition of 膂宍 (そしし)
そしし
                        膂宍
そしし
soshishi
noun
•
                
meat, flesh, or muscles along the spine(archaism)
Other readings:
                膂宍【そじし】
、背宍【そしし】
、背宍【そじし】
                Related Kanji
| 膂 | backbone | 
| 宍 | muscles, meat | 
| 背 | stature, height, back, behind, disobey, defy, go back on, rebel |