boil down

En español: hervirle el agua a, herver el líquido de, resumirse, reducirse a

1. To reduce in volume by boiling. (intransitive, transitive) · He boiled the soup down so it wouldn't be so weak.
2. To become reduced (to the most central elements or ingredients: to the essence, core, or implication for action). (intransitive) · So what this boils down to is that you still owe me that fifty bucks.
3. To reduce (to the most central elements or ingredients: to the essence, core, or implication for action). (transitive) · My dissertation is 342 pages long, and I'm required to boil it down to a one-page abstract?!