1650s, alteration of simperen "to simmer" (late 15c.), possibly of imitative origin. Figurative sense, of feelings, "to be agitated" is from 1764. Opposite sense, in simmer down, first recorded 1871.
"I must and will keep shady and quiet till Bret Harte simmers down a little." [Mark Twain, letter, 1871]
in. to reduce one's anger. : Simmer down, you guys.
in. to get quiet. : I waited till things began to simmer down, and then I started.
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Example sentences
Bring the mixture to a boil, then reduce the heat to a low simmer.
Gradually add the grits, return to a boil, then reduce to a simmer.
Bring to a boil, cover and reduce heat to maintain a simmer.
Bring to a boil over high heat, then lower heat to maintain a simmer.
Bring pork and water to a boil in a large pot, skimming froth, then reduce heat to a simmer.
At times the temperature drops to a mere simmer but it occasionally comes to a full rolling boil as well.
Bring the mixture to a boil, cover, then reduce the heat to maintain a simmer.
Bring to a boil, cover, then simmer for fifteen minutes.
Bring to a boil, then cover and simmer for a couple of hours.
Cover and put the heat on high until the contents begin to boil then set to simmer on low.