Webster's English Dictionary

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fizz

1. fizz \'fiz\ vi [prob. of imit. origin] 1: to make a hissing or 
   sputtering sound : EFFERVESCE  2: to exhibit excitement or exhilaration 
2. fizz \-e-\ n 1a: a hissing sound  1b: LIVELINESS, SPIRIT  2: an 
   effervescent beverage  - fizzy aj