Home/Vocab Vault/膨らむ膨らむ膨らむふくらむto expandN2Godan VerbFreq. #9048Meanings1to expand2to swell (out)3to get big4to become inflatedConjugationsFormJapanesePolite (ます)ふくらみますて-formふくらんでPast (casual)ふくらんだPast (polite)ふくらみましたNegative (casual)ふくらまないNegative (polite)ふくらみませんShow all 12 formsRelated WordsSame Kanji膨大ぼうだいhuge膨らますふくらますto swell膨れるふくれるto swell (out)Learn MoreGrammar〜てte-form (connecting)〜ますpolite verb ending〜でしたwas (polite past)〜ができますcan do ~受身形passive (be done to)Practice 膨らむ in JIVXReinforce this word with AI-graded sentence practice and spaced repetition.Start Practicing Free