Source : Webster's Revised Unabridged Dictionary (1913)

Gnar \Gnar\, v. i. [imp. & p. p. {Gnarred}; p. pr. & vb. n.
   {Gnarring}.] [See {Gnarl}.]
   To gnarl; to snarl; to growl; -- written also gnarr.
   [Archaic]

         At them he gan to rear his bristles strong, And felly
         gnarre.                                  --Spenser.

         A thousand wants Gnarr at the heels of men. --Tennison.