Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
pig-a-back is an adverb meaning "on a railroad flatcar". It carries 2 recorded senses.
Definitions, synonyms and semantic relations for pig-a-back come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.