Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
underachieve is a verb meaning "perform less well or with less success than expected". It carries one recorded sense.
perform less well or with less success than expected
“John consistently underachieves, although he is very able”
“My stocks underperformed last year”
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 underachieve come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.