Wiktionary
built up
(alternative spelling of built-up English) v
(en-pastbuild up)
Usage examples of "built up".
Of course, it was his father who built up the rubber combine, but at least this Imberline hasn't done anything to weaken that combine.
We're fighting for liberty and democracy, and that automatically means that we're also fighting to preserve the kind of social stability that liberty and democracy have built up in this country.