simmer

To cook or undergo heating slowly at or below the boiling point.

“The soup simmered on the stove.”

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.”

figurativeTo be on the point of breaking out into anger; to be agitated.

figurativeTo 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.”

figurativeTo develop gradually, of an idea or plan.

Boil slowly at low temperature

“simmer the sauce”

“simmering water”

The state or process of simmering.

“The kettle was kept on the simmer.”

informalvideo gamesSomeone who plays a sim (a simulation game), particularly The Sims.

Temperature just below the boiling point

“the stew remained at a simmer for hours”