Snarl \Snarl\, v. t. [imp. & p. p. Snarled; p. pr. & vvb. n. Snarling.]

[Etymol. uncertain.]

To form raised work upon the outer surface of (thin metal ware) by the repercussion of a snarling iron upon the inner surface.

Source: Webster's Revised Unabridged Dictionary (1913)