Source : Webster's Revised Unabridged Dictionary (1913)

Smuggle \Smug"gle\, v. t. [imp. & p. p. {Smuggled}; p. pr. & vb.
   n. {Smuggling}.] [Of Low German or Scand. origin; cf. LG.
   smuggeln, D. smokkelen, G. schmuggeln, Dan. smugle, Sw. smyga
   to introduce or convey secretly, Dan. i smug secretly, D.
   smuigen to eat in secret, AS. sm?gan to creep. See {Smock}.]
   1. To import or export secretly, contrary to the law; to
      import or export without paying the duties imposed by law;
      as, to smuggle lace.

   2. Fig.: To convey or introduce clandestinely.

Source : WordNet®

smuggling
     n : secretly importing prohibited goods or goods on which duty
         is due