Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
punchball is a noun meaning "an inflated ball or bag that is suspended and punched for training in boxing". It carries one recorded sense.
an inflated ball or bag that is suspended and punched for training in boxing
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for punchball come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.