to cook or cook in a liquid at or just below the boiling point.

to make a gentle murmuring sound, as liquids cooking just below the boiling point.

to be in a state of subdued or restrained activity, development, excitement, anger, etc.

The town simmered with rumors.

to keep (liquid) in a state approaching boiling.

to cook in a liquid that is kept at or just below the boiling point.

the state or process of simmering. ?

simmer down,

to reduce in volume by simmering.

Slang . to become calm or quiet, as from a state of anger or turmoil

We waited for the audience to simmer down.

verb

freeze

verb

be agitated , be angry , be tense , be uptight , bubble , burn , churn , cook , effervesce , ferment , fizz , fret , fricassee , fume , parboil , rage , seethe , smart , sparkle , stew , stir , warm , smolder , boil , brood , coddle

phrasal verb

collect , contain , control , cool