Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
high-up is a noun meaning "an important or influential (and often overbearing) person". It carries one recorded sense.
an important or influential (and often overbearing) person
Definitions, synonyms and semantic relations for high-up come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.