| Noun | 1. | birr - the basic unit of money in Ethiopia; equal to 100 centscent - a fractional monetary unit of several countries | |
| 2. | birr - sound of something in rapid motion; "whir of a bird's wings"; "the whir of the propellers"sound - the sudden occurrence of an audible event; "the sound awakened them" | |
| Verb | 1. | birr - make a soft swishing sound; "the motor whirred"; "the car engine purred"sound, go - make a certain noise or sound; "She went `Mmmmm'"; "The gun went `bang'" | |