Webster's English Dictionary

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fug

1. fug \'f*g\ \'f*g-e-\ n [prob. alter. of 2fog] : an odorous emanation; 
   esp : the stuffy atmosphere of a poorly ve ntilated space - fug.gy aj
2. fug vb or fugged;  or fug.ging : to loll indoors in a stuffy atmosphere  
   : to make stuffy and odorous