To drive too hard, or far, or beyond strength.
A gear, on an automobile, higher than the traditional top gear, mainly to allow better fuel economy at highway speeds. In the 21st century, such gears are no longer viewed as "extra" and thus rarely called by this name.
Near-synonym: top gear
From Middle English overdriven, from Old English oferdrīfan, equivalent to over- + drive. Cognate with Saterland Frisian uurdrieuwe (“to overdo, overstate”), Dutch overdrijven (“to exaggerate”), Germa...
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A gear ratio higher than 1:1: one in which a single revolution of the driving element corresponds to more than one revolution of the driven element.