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Assuming you're talking about a phrase like 'the motor purred like a kitten'. It simply means the engine is so perfectly tuned, that instead of a noisy, rough engine sound, it produces a smooth, quiet 'purr' note. Think of it like comparing the engine noise from a 10-year-old Ford, against a brand-new Rolls Royce !

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Angela Veum

Lvl 13
2y ago

What else can I help you with?