The word "simmer" refers to a cooking technique where food is cooked in liquid just below the boiling point. It allows the flavors to meld together without being disturbed by strong bubbles. The temperature is typically between 185°F to 205°F (85°C to 96°C). Additionally, "simmer" can be used metaphorically to indicate a gradual buildup of emotions or intensity, such as simmering anger or tension.
The word "simmer" comes from Middle English "simmeren," which is derived from the Old English "simor," meaning "to melt or dissolve." It has evolved over time to encompass both cooking techniques as well as the metaphorical use in emotions.