膨(ふく)らますto swell, to expand, to inflate, to bulge

風船(ふうせん)を息(いき)で膨(ふく)らます。

Inflate the balloon with breath. {to swell, to expand, to inflate, to bulge}

小鼻(こばな)をピクピクと膨(ふく)らます。

The nostrils flare up twitchingly. {to swell, to expand, to inflate, to bulge}

大(おお)きな浮(う)き輪(わ)を膨(ふく)らますのは大変(たいへん)です。

Inflating a large float is difficult. {to swell, to expand, to inflate, to bulge}

イースト菌(きん)にはパンを膨(ふく)らます働(はたら)きがあるのだとか。

I heard that yeast has the function to make bread rise. {to swell, to expand, to inflate, to bulge}

風船(ふうせん)を一息(ひといき)で膨(ふく)らますには、肺活量(はいかつりょう)を鍛(きた)える必要(ひつよう)があります。

In order to inflate a balloon in one breath, you need to train your lung capacity. {to swell, to expand, to inflate, to bulge}