Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
wiseacre is a noun meaning "an upstart who makes conceited, sardonic, insolent comments". It carries one recorded sense.
an upstart who makes conceited, sardonic, insolent comments
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 wiseacre come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.