2. Noun. (science engineering) A shift to a higher level, such as of frequency or growth ¹
3. Verb. (automotive) To shift to a higher gear ¹
4. Verb. (science engineering) To shift to a higher level, such as of frequency or growth rate ¹
¹ Source: wiktionary.com
Definition of Upshift
1. to shift an automotive vehicle into a higher gear [v -ED, -ING, -S]