From Wiktionary, the free dictionary
From up- step.
upstep (plural upsteps)
- An upward shift of tone between the syllables or words of a tonal language.
upstep (third-person singular simple present upsteps, present participle upstepping, simple past and past participle upstepped)
- To apply an upward shift of tone between the syllables or words of a tonal language.
