1. To become bloated or swollen or puff up.
2. To make bloated or swollen.

(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.