be the essential element;
"The proposal boils down to a compromise"
be cooked until very little liquid is left;
"The sauce should reduce to one cup"
cook until very little liquid is left;
"The cook reduced the sauce by boiling it for a long time"
- We boiled down the chemicals to condense it.
- The Four-Way Test compresses ethical decisions down to something that can be hung on a small wall plaque.
- Boil down the article to a few sentences.