Definition of upshift verb from the Oxford Advanced American Dictionary

 

upshift

 verb
verb
NAmE//ˈʌpʃɪft//
 
[intransitive]Verb Forms present simple I / you / we / they upshift
 
he / she / it upshifts
 
past simple upshifted
 
-ing form upshifting
 
 
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to change into a higher gear in a vehicle
See the Oxford Advanced Learner's Dictionary entry: upshift