purr

US /pɝː/
UK /pɝː/
"purr" picture
1.

a low, continuous, vibratory sound made by a cat or similar animal, especially when contented.

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The cat's soft purr filled the quiet room.
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I love the sound of a happy cat's purr.
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rumblevibration
1.

to make a low, continuous, vibratory sound, as a cat does when contented.

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The cat began to purr contentedly as I stroked its fur.
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The engine of the luxury car began to purr smoothly.
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rumblevibratedrone