upshiftPronunciation: /ˈʌpʃɪft/Definition of upshift verb 1 [no object] change to a higher gear in a motor vehicle: I caught a flash of the driver hand as he upshifted 2 [with object] increase:stricter driving laws that upshifted the penalties for drunk-driving noun 1a change to a higher gear: the upshifts are mostly smooth 2an increase in something: a temperature upshiftupshift in other Oxford dictionaries Definition of upshift in the US English dictionary