Syllable division and stress derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
gesticulating is an adjective meaning "making gestures while speaking". It carries one recorded sense.
making gestures while speaking
“her gesticulating hands and arms made words almost unnecessary”
Definitions, synonyms and semantic relations for gesticulating come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. .