1. To billow forth; as of smoke or waves; SYN. wallow.
2. To move with great difficulty.
3. To rise and move, as in waves or billows; SYN. surge, heave.

(Irregular preterit, past participle: swelled, swollen).
1. To become filled with pride, arrogance, or anger; SYN. puff up.
2. To cause to become swollen.
3. To expand abnormally; SYN. swell up, distend.
4. To increase in size, magnitude, number, or intensity.

Expand abnormally