verb

• (intransitive) To cook or undergo heating slowly at or below the boiling point.
  "The soup simmered on the stove."
• (transitive) To cause to cook or to cause to undergo heating slowly at or below the boiling point.
  "Simmer the soup for five minutes, then serve."
• (intransitive, figurative) To be on the point of breaking out into anger; to be agitated.
  "Maybe that really did happen, and Robin's anger at his wife had simmered for this long?"
• (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.
  "I tried to get through to him; all that's left for me to do is simmer."

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.