Reduce the volume of a liquid by boiling: they boil down the syrup until it is very thick
More example sentences
- Meanwhile the cooking liquor would be boiled down to make a thickened gravy.
- The amount of red wine the recipe called for seemed rather too small to me, so I used more wine - about three times as much - by boiling it down to the same volume as indicated in the recipe.
- Skim the fat from pan juices, and reduce the drippings by boiling them down to a delicious sauce.