v.remove the bridle from (a horse or mule)

GIDDYUP! Mazda unbridles its third-generation MX-5 Miata at Geneva.(News)(Brief Article)
BRADLEY UNBRIDLES KERREY IN ASSAULT ON GORE RECORD
Horse Show Unbridles Ire about Soring -- Germantown Event Isn't Sidestepping McConnell Matter
Will Unbridle's Song Run Here? Arlington Expects Answer Today
Time to Unbridle U.S. Thoroughbred Racetracks? Lessons from Australian Bookies
Return to the Wild; Residents Unbridle Backyards as Refuge for Animals, Birds
Recursive Double-Size Modular Multiplications without Extra Cost for Their Quotients
Sonocubic fine: novo software de ultrassonografia tridimensional para o rastreamento das doen?as cardíacas congênitas
Selected Areas in Cryptography