Phrasal Verbs with Boil: Meanings and Clear Uses
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Boil down describes making a sauce thicker by simmering, or condensing a complex situation into a simple explanation. Boil down to introduces the final deciding factor or main point. Boil over describes bubbling liquid escaping a pot, or people losing control of their temper. Boil away describes liquid heating until nothing remains in the container.
The entire sales pitch boils down to saving money on fuel.