ぼうちょう 膨張 Common word JLPT N1 Wanikani level 52 LinksSentence search for 膨張Sentence search for ぼうちょうSentence search for 膨脹Kanji details for 膨 and 張Edit in JMdict Noun, Suru verb, Intransitive verb1. expansion; swelling; increase; growthOther forms膨脹 【ぼうちょう】 Discussions Log in to talk about this word.