CAE COMPACT phrasal verbs with UP
become stronger or more intense; grow, develop or accumulate. "he _____ __ the store from nothing"
BUILT UP
make someone or something tidy or neat. restore order or morality to something. "the police chief was given the job of _______ __ a notorious district"
cleaning up
acquire information about a particular subject by studying it intensively. "she spent the time ______ __ on antenatal care"
reading up