boil down

[boil down] {v.} 1. To boil away some of the water from; make less by boiling.

She boiled down the maple sap to a thick syrup.

The fruit juice boiled down until it was almost not good for jelly.

2. To reduce the length of; cut down; shorten.

The reporter boiled the story down to half the original length.

3. To reduce itself to; come down to; be briefly or basically.

The whole discussion boils down to the question of whether the government should fix prices.