Definitions from Wiktionary ( )

▸ verb:  (intransitive) To cook or undergo heating slowly at or below the boiling point.
▸ verb:  (transitive) To cause to cook or to cause to undergo heating slowly at or below the boiling point.
▸ verb:  (intransitive, figurative) To be on the point of breaking out into anger; to be agitated.
▸ verb:  (intransitive, figurative) 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.
▸ verb:  (intransitive, figurative) To develop gradually, of an idea or plan.
▸ noun:  The state or process of simmering.
▸ noun:  (informal, video games) Someone who plays a sim (a simulation game), particularly The Sims.
▸ noun:  (slang, video games) A fan of the video game series The Sims.
▸ noun:  A surname from German.

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