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Overdrive Border Collies » Home of the Overdrive Border ColliesObedience & Slip Leads. WELCOME TO THE HOME OF THE. O ver drive (ō vər-drīv ). 1 A gearing mechanism of a motor vehicle engine that reduces the power. Output required to maintain driving speed in a specific range by lowering the gear ratio. 2 Informal: A state of heightened activity or concentration. Herding, agility, obedience. Your best friend forever.
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