purr like a cat

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purr like a cat

1. Of an engine, motor, or other piece of machinery, to run very smoothly and efficiently (often signified by a smooth, rich humming noise, not unlike that of a cat's purr). Once get this carburetor repaired, this old car is going to purr like a cat again. I just replaced the motherboard on my PC and installed a bunch of new RAM—now it's purring like a cat.
2. Of person, to sigh, hum, or moan with contentment or pleasure. The kids purred like cats as they ate their ice cream cones. I know a few tricks that will have your partner purring like a cat.
See also: cat, like, purr

purr like a cat

 and purr like a kitten 
1. Fig. [for an engine] to run well and smoothly. My car really purred after I got it tuned up. New sparkplugs and this old heap will really purr like a cat.
2. Fig. [for a person] to be very pleased, and perhaps moan or purr with pleasure. She was so pleased that she purred like a cat. Sarah really purrs like a kitten when she is happy.
See also: cat, like, purr

purr (like a cat)

in. [for an engine] to run well and smoothly. New spark plugs and this old heap will really purr like a cat.
See also: cat, like, purr