Phrasal verb improve on/upon something (definition of improve from the cambridge advanced learner's dictionary & thesaurus © cambridge university press)
If you improve on a previous achievement of your own or of someone else, you achieve a better standard or result.
We need to improve on our performance against france.
[verb + on]
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.
After months.
To advance to a more desirable state:
Ameliorate, amend, better, help, meliorate, upgrade.
A drawing of a man pointing to a graphing showing an improvement in sales numbers.
Improvement is the process of a thing moving from one state to a state considered to be better, usually by a change.
Improve, ameliorate, better imply bringing to a more desirable state.
Improve usually implies remedying a lack or a felt need:
To improve a process, oneself (as by gaining more knowledge).
Definition of improve.
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Definition of improve verb in oxford advanced learner's dictionary.
Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
The meaning of improve is to enhance in value or quality :
Make better.
How to use improve in a sentence.
Synonym discussion of improve.