Source : Webster's Revised Unabridged Dictionary (1913)

Bowstring \Bow"string`\, v. t. [imp. & p. p. {Bowstringed}or
   {Bowstrung}; p. pr. & vb. n. {Bowstringing}.]
   To strangle with a bowstring.

Bowstringed \Bow"stringed`\, p.a.
   1. Furnished with bowstring.

   2. Put to death with a bowstring; strangled.