Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
round-arm is an adjective and adverb meaning "with the arm swung round at shoulder height". It carries 2 recorded senses.
with an outward or horizontal swing of the arm
“he hit the ball round-arm”
Definitions, synonyms and semantic relations for round-arm come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.