simmer down
— Verb
– English
~ become quiet or calm, especially after a state of agitation; "After the fight both men need to cool off."; "It took a while after the baby was born for things to settle down again."
simmer
— Verb
– English
~ boil slowly at low temperature; "simmer the sauce"; "simmering water"
simmer
— Noun
– English
~ temperature just below the boiling point; "the stew remained at a simmer for hours"
simmering
— Noun
– English
~ cooking in a liquid that has been brought to a boil