Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
second-stringer is a noun meaning "an athlete who plays only when a starter on the team is replaced". It carries one recorded sense.
an athlete who plays only when a starter on the team is replaced
Definitions, synonyms and semantic relations for second-stringer come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.