simmer

Short definition from Wiktionary

Verb

1. 1
   To cook or undergo heating slowly at or below the boiling point.
2. 2
   To cause to cook or to cause to undergo heating slowly at or below the boiling point.
3. 3
   To be on the point of breaking out into anger; to be agitated.
4. 4
   To remain angry with someone or something past the point of exhaustion; to resign oneself to holding a grudge, especially after some failed attempts to resolve a situation.
5. 5
   To develop gradually, of an idea or plan.

Noun

1. 1
   The state or process of simmering.
2. 2
   Someone who plays a sim (a simulation game), particularly The Sims.
3. 3
   A fan of the video game series The Sims.

Proper noun

1. 1
   A surname from German.