Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
side-to-side is an adjective meaning "alternately left and right with respect to a central point". It carries one recorded sense.
alternately left and right with respect to a central point
“the side-to-side motion of the boat”
Definitions, synonyms and semantic relations for side-to-side come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.