octavate

Short definition from Wiktionary

Verb

1. 1
   To sound one octave higher or lower: To resonate or sound one octave higher or lower.
2. 2
   To sound one octave higher or lower: To span (at least) one octave in playing a musical instrument.
3. 3
   To sound one octave higher or lower: To double the pitch of (a part of itself).
4. 4
   To convert (the expression of a number) from denary to octal notation.

Noun

1. 1
   octave (transfiguratively)