|1.||[ verb ] make a soft swishing sound, as of a motor working or wings flapping|
|Synonyms:||whiz birr whirr purr whizz|
|Related terms:||go whiz|
|2.||[ noun ] sound of something in rapid motion|
|Synonyms:||whirring birr whirr|
: "whir of a bird's wings" "the whir of the propellers"
|Related terms:||sound whizz|