Swell up means the same as . 肿胀

adjective [原级] 骄傲自大;自负的

The wind swelled (out) the sails. 风鼓起了帆。

verb [vt. 及物动词] 膨胀;隆起;增大(swell 的过去分词)

Membership has swelled to over 20 000. 成员增加到2万余人。

单词造句:
网友用 “Swelled” 造句精选
The cheering swelled through the hall. 欢呼声越来越大,响彻大厅。