upshift

[uhp-shift]
verb (used with object)
  1. to shift (an automotive transmission or vehicle) into a higher gear.
noun
  1. an act or instance of upshifting.

Origin of upshift

First recorded in 1950–55; up- + shift
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018