Boston Police report the older teen got the better of the younger one in a knife fight over a bicycle around 3:20 p.m., Sunday at 4 Perth St. in Dorchester.

The older teen was arrested on a charge of assault and battery with a dangerous weapon. The stabbed kid, from Jamaica Plain, was taken to Boston Medical Center and is expected to survive. Police say he'll also be called into court to face a charge of assault and battery with a dangerous weapon.

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