to develop or move gradually towards sth, usually sth more exciting or extreme :
The music worked up to a rousing finale.
I began by jogging in the park and worked up to running five miles a day.
to develop or move gradually towards sth, usually sth more exciting or extreme :
The music worked up to a rousing finale.
I began by jogging in the park and worked up to running five miles a day.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005