A hissing or bubbling sound, or an informal word for a fizzy drink.
Onomatopoeia from Middle English, imitating the sound of gas escaping from liquid. Related to similar sound-words in Germanic languages describing effervescence.
Onomatopoeia words like 'fiz' are fascinating because they actually sound like what they describe—which is why different languages often have totally different versions (like Japanese 'shū shū' for the same sound)!
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