Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
press-up is a noun meaning "an arm exercise performed lying face to the floor and pushing the body up and down with the arms". It carries one recorded sense.
an arm exercise performed lying face to the floor and pushing the body up and down with the arms
Definitions, synonyms and semantic relations for press-up come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.