To increase in size or volume as a result of internal pressure. The balloon began to swell as more air was pumped into it.
To become larger or rounder in size, typically as a result of an accumulation of fluid. Her ankle started to swell after she twisted it during the game.
To increase in intensity, degree, or amount. The crowd's cheers swelled as the team scored the winning goal.
To rise or expand in a wave-like motion. The ocean swelled as the storm approached the coast.
To become filled with pride or satisfaction. He swelled with pride when he received the award for his hard work.