im·prove 
/ɪmˈpru:v/ verb
im·proves; im·proved; im·prov·ing /ɪmˈpru:v/ verb 1 [+ obj] : to make (something) better
▪ This operation will greatly/dramatically/significantly improve her chances of survival. ▪ The advertising campaign has improved sales. 2 [no obj] : to become better
▪ Maybe we'll buy a house when our financial situation improves. ▪ Her writing has improved since the beginning of the school year. ▪ The company has been having steadily improving sales.
▪ This operation will greatly/dramatically/significantly improve her chances of survival. ▪ The advertising campaign has improved sales.
▪ Maybe we'll buy a house when our financial situation improves. ▪ Her writing has improved since the beginning of the school year. ▪ The company has been having steadily improving sales.
improve on/upon [phrasal verb]
improve on/upon (something) : to do better than (something previously done)
▪ After months of study, I improved on my original score. ▪ It'll be hard to improve upon the success they had last year.
▪ After months of study, I improved on my original score. ▪ It'll be hard to improve upon the success they had last year.
— improved adjective [more improved; most improved]
▪ The campaign resulted in greatly improved sales. ▪ She was voted the most improved player on the team.
▪ The campaign resulted in greatly improved sales. ▪ She was voted the most improved player on the team.
