I. ˈ ̷ ̷ˌ ̷ ̷ intransitive verb
Etymology: up (I) + shift
: to shift into a higher automotive gear
the car … automatically upshifts to the cruising range as speed increases — Report: General Motors Corp.
the driver upshifted into second
II. noun
: a shift into a higher automotive gear
the upshift to second speed in the low range is produced by the automatic controls — Joseph Heitner