筈 [kuò]  
1. The tail of an arrow, specifically the part that rests on the bowstring when shooting.  
(English: tail of the arrow)  
筈 [kuò]  
1. The tail of an arrow, specifically the part that rests on the bowstring when shooting.  
(English: tail of the arrow)  
【Quote】  
1. "The parts that connect are not constant, likening to the string and the tail." — Lu Ji, "For Yan Yan's Gift to His Wife"  
(*Quoted from Traditional Dictionary Explanation)  
筈 [kuò]  
1. The terminal hook of an arrow that rests on the bowstring.  
— Tang, Lu Guimeng, "In Response to Wu Zhong's Hundred Rhymes on Suffering Rain."  
Similar to "栝."