firm up something

Từ điển Oxford Advanced Learner 8th

ˌfirm ˈup sth derived
1. to make arrangements more final and fixed
•The company has not yet firmed up its plans for expansion.
•The precise details still have to be firmed up.
2. to make sth harder or more solid
•A few weeks of aerobics will firm up that flabby stomach.
Main entry: ↑firm_derived