1To swell out, expand, or bulge (intransitive); used for things like balloons, fabric, or cheeks puffing out.
風船が空気で膨れるのを見て子どもたちが喜んだ。
The children were delighted to see the balloon inflate with air.
寒さで手袋が膨れてしまった。
The gloves puffed up because of the cold.
パン生地が上手く膨れておいしく焼けた。
The dough rose well and baked deliciously.
2To get cross, sulk, or pout; to become sullen and show a sulky expression.
子どもは欲しいおもちゃを買ってもらえず、膨れてしまった。
The child sulked because they didn't get the toy they wanted.
注意されて彼は膨れているが、すぐに仲直りした。
He sulked after being scolded, but they made up quickly.
そんな態度で膨れないで、ちゃんと話し合おう。
Don't pout like that—let's talk it out properly.