Over the last couple of days, this anger had built into a red rage.

The anger had been building in him a long time.

The anger was building in him again, but he didn't care.

The crowd and their anger built over the course of the day.

The anger built on its own now, no matter how she tried to suppress it.

Therefore the anger is suppressed, and builds on itself over time.

The anger and frustration was building in the witness stand.

Quinn's anger had been building during the course of his long, hard journey.

A great anger at this gang of thieves was building in him.

This time, he had to let the anger build.