EXAMPLES FROM THE WEB FOR SIMMERING
Soon the whole forecastle was simmering with talk about revenge.
Can you ever believe that, I have called you a 'simmering pot of Emerald broth'?
Stir fifteen minutes, and, while simmering, flavor with vanilla or lemon.
Harold, just then, had happily uncovered the simmering kettle.
With regard to simmering taps, he also holds a contrary opinion.
Soon goulash was simmering in the pot, and kasa was tossed together.
The soup was simmering in its pot, the bowls were ready set on the table.
I'm too voluminous—I'm a boiler-over, not a simmering stick-at-it.
Upon the fire a pot was simmering, and a good savour came from it.
This interesting case has been simmering in the law-courts since 1820.
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.
Related: Simmered; simmering. The noun meaning "a condition of simmering" is from 1809.