Source : Webster's Revised Unabridged Dictionary (1913)

Insinew \In*sin"ew\, v. t. [imp. & p. p. {Insinewed}; p. pr. &
   vb. n. {Insinewing}.]
   To strengthen, as with sinews; to invigorate. [Obs.]

         All members of our cause, . . . That are insinewed to
         this action.                             --Shak.