upshift

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upshift /ˈʌpˌʃɪft/ verb
upshifts; upshifted; upshifting
upshift
/ˈʌpˌʃɪft/
verb
upshifts; upshifted; upshifting
Learner's definition of UPSHIFT
[no object]
: to put the engine of a vehicle into a higher gear opposite downshift

— upshift

noun, plural upshifts [count]