simmer

1 simmer /ˈsɪmɚ/ verb
simmers; simmered; simmering
1 simmer
/ˈsɪmɚ/
verb
simmers; simmered; simmering
Britannica Dictionary definition of SIMMER
1 
: to cook (something) so that it is almost boiling for a certain period of time
[+ object]
[no object]
2 
[no object]
a  : to be filled with a strong feeling that is difficult to control or hide — usually + with
b  : to be felt strongly by someone without being directly shown or expressed
3 
[no object] : to continue for a long time without producing a definite result
4 
[no object] : to develop slowly

simmer down

[phrasal verb]
: to become calm after being very angry or excited
2 simmer /ˈsɪmɚ/ noun
2 simmer
/ˈsɪmɚ/
noun
Britannica Dictionary definition of SIMMER
[singular]
: a state of simmering : a way of cooking that is close to boiling