fizzle: [16] Originally, fizzle meant ‘fart silently or unobtrusively’: ‘And then in court they poisoned one another with their fizzles’, Benjamin Walsh’s translation of Aristophanes’ Knights 1837. Then in the mid-19th century it started to be used for a ‘weak spluttering hissing sound’, and hence figuratively ‘end feebly’. In the earlier sense, fizzle was probably a derivative of the now obsolete English verb fist ‘fart’ (source of feisty), which came ultimately from Indo-European *pezd- (no doubt imitative of the sound of breaking wind).
The later sense is close enough semantically to suggest that it is probably a metaphorical extension of the earlier, but it could also be a new formation, based on fizz [17] (which was also of onomatopoeic origin). => feisty
