He tried his best to simmer down and go to sleep, but every few minutes hed boil over again.
"simmer down," he said, as he seated himself at the head of the table.
It'll simmer down and work out, I expect, to a bad quarrel you had with Karen that's parted you.
Kieran, on a camp-stool, waited for the laughter to simmer down.
It took him a lifetime to simmer down his business to just yes and no.
Then with these before you, you can soon, by stating them and rearranging them, simmer down your case into arguable form.
Miss Phillips was too wise to call a Scout meeting immediately; she wanted to give the discussion a chance to simmer down.
He stomped over and helped himself to some soup and waited for his anger to simmer down.
Well, we'll simmer down when the turn comes, and though I'm piling up dollars, I'll be thankful.
With that some several policemen run up, and I had to simmer down.
1650s, alteration of simperen "to simmer" (late 15c.), possibly imitative; not thought to be connected to simper (v.). OED says the change is "probably due to a feeling of phonetic appropriateness." Figurative sense, of feelings, "to be agitated" is from 1764. Opposite sense, in simmer down, first recorded 1871, probably from the notion of moving from a full boil to a mere simmer.
I must and will keep shady and quiet till Bret Harte simmers down a little. [Mark Twain, letter, 1871]Related: Simmered; simmering. The noun meaning "a condition of simmering" is from 1809.