Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
tranquillizing is an adjective meaning "tending to soothe or tranquilize". It carries one recorded sense.
tending to soothe or tranquilize
“valium has a tranquilizing effect”
“took a hot drink with sedative properties before going to bed”
Definitions, synonyms and semantic relations for tranquillizing come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.