"purr" in the noun sense
a low vibrating sound typical of a contented cat
"purr" in the verb sense
1. whizz, whiz, whirr, whir, birr, purr
make a soft swishing sound
"the motor whirred"
"the car engine purred"
2. purr, make vibrant sounds
indicate pleasure by purring characteristic of cats
Source: WordNet® (An amazing lexical database of English)
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