boil down
boil down а) уваривать(ся), выпаривать(ся), сгущать(ся) Use plenty ofvegetables because the cooking boils them all down to a small quantity. Put alot of the vegetable in the pan, it all boils down (to a small quantity). б)сокращать(ся), сжимать(ся) You can boil the long story down to a few sentencesand it still has the same meaning. в) сводиться к чему-л The whole matterboils down to a power struggle between the trade union and the directors.
Англо-русский словарь. — М.: Советская энциклопедия.
В.К. Мюллер.
1969.