Source : Webster's Revised Unabridged Dictionary (1913)

Sunburn \Sun"burn`\, v. t. [imp. & p. p. {Sunburned}or
   {Sunburnt}; p. pr. & vb. n. {Sunburning}.]
   To burn or discolor by the sun; to tan.

         Sunburnt and swarthy though she be.      --Dryden.

Sunburning \Sun"burn`ing\, n.
   Sunburn; tan. --Boyle.