枕块 (枕塊) zhěnkuài
          
              zhěnkuài 
              
              verb 
              to use clay for a pillow 
              Domain: Literary Chinese 文言文
              
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                Notes: During mourning period (CC-CEDICT '枕塊'; Guoyu '枕塊'; Mathews 1931 '枕塊', p. 38)