simmer down

You can thin out jams or preserves—apricot, cherry, fig, even marmalade—or simmer down fresh or frozen fruit into a sticky glaze.

However, the toxicity in their relationship appeared to simmer down over the years.

Tensions seem to have simmered down in recent days, though the public will have to wait to see what effects the beef may have on the stars' reputations.

Cohen said he believes the protests will likely simmer down over the summer, as students return home.

I make our rhubarb days last a little longer by saving some to simmer down with sugar and water for the prettiest simple syrup you have ever seen.