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Noun whirr has 1 sense
whir, whirr, whirring, birr - sound of something in rapid motion; "whir of a bird's wings"; "the whir of the propellers"--1 is a kind of sound
 
 
Verb whirr has 2 senses
whizz, whiz, whirr, whir, birr, purr - make a soft swishing sound; "the motor whirred"; "the car engine purred"--1 is one way to sound, go
 Sample sentences:
 Cars whirr in the streets
 The streets whirr with cars
 
churr, whirr - make a vibrant sound, as of some birds--2 is one way to utter, emit, let out, let loose
 Sample sentence:
 Something ----s
 
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