Source : Webster's Revised Unabridged Dictionary (1913)

Inleague \In*league"\, v. t. [imp. & p. p. {Inleagued}; p. pr. &
   vb. n. {Inleaguing}.]
   To ally, or form an alliance witgh; to unite; to combine.

         With a willingness inleague our blood With his, for
         purchase of full growth in friendship.   --Ford.