backstring
/ˈbæks.trɪŋ/Definitions
1. noun
A string or thread used for tying or fastening a bowstring to the back of a bow, especially a bowstring of a longbow or a crossbow.
“The archer carefully adjusted the backstring of her longbow before taking aim at the target.”
2. verb
To adjust or tighten a bowstring to the back of a bow, especially a bowstring of a longbow or a crossbow.
“The archer had to backstring her bow before it would shoot straight.”