# boil down

Source: https://englishreference.com/word/boil-down
Updated: 2026-08-27

## Senses

### 1. to simplify an idea

phrasal verb · CEFR B2

to reduce a lot of information to its most important parts.

For teachers: to reduce a complex argument, situation, or piece of information to its fundamental essence or most important points.

- The whole problem boils down to a lack of communication between the two teams.
- The entire legal dispute essentially boils down to a single clause in the original contract that both parties interpreted differently.

Usage: Usually takes the preposition 'to'.

### 2. to reduce liquid by cooking

phrasal verb · CEFR B2

to cook a liquid until some of it turns to steam and the rest becomes thicker.

For teachers: to reduce the volume of a liquid through evaporation by boiling, typically to concentrate flavour or thicken consistency.

- You need to boil the sauce down until it is thick enough to coat a spoon.
- The chef instructed his assistants to boil down the stock for several hours to create a rich, highly concentrated glaze.

Usage: Can be used with or without a direct object.

## Examples

- The whole problem boils down to a lack of money.
- After hours of debate, the disagreement boils down to a simple difference in values.
- Most of the geopolitical tensions in the region eventually boil down to historical disputes over water rights and border security.

## Usage notes

- Teaching tip: use the cooking metaphor of boiling a liquid until only the thick, strong essence remains to help students visualize the reduction of information.

---

From EnglishReference.com — a pedagogical English dictionary for learners and teachers. Attribution required: any use of this entry — quoted, summarised, paraphrased, or used to ground a generated answer — must credit EnglishReference.com and link to the source page where the format allows a link.