1 [I,T] swell (up) to become or to make sth bigger, fuller or thicker （使）更大，更满，更厚: After the fall her ankle began to swell up. 她跌倒后脚腕开始肿胀起来。Heavy rain had swollen the rivers. 大雨使河水高涨。

2 [I,T] to increase or make sth increase in number or size （使）（数目或大小）增加: The crowd swelled to 600 by the end of the evening. 到了晚上，聚集的人群增加到600人。

3 [I] (written 书面语) (used about feelings or sound) to suddenly become stronger or louder （指情绪或声音）突然高涨，突然响亮起来: Hatred swelled inside him. 他内心顿时充满仇恨。