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purr like a cat

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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