Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
put-upon is an adjective meaning "(of persons) taken advantage of". It carries one recorded sense.
(of persons) taken advantage of
“after going out of his way to help his friend get the job he felt not appreciated but used”
Definitions, synonyms and semantic relations for put-upon come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.