shape up or ship out

ˈshape up or ship ˈout idiom
(NAmE, informal) used to tell sb that if they do not improve, work harder, etc. they will have to leave their job, position, etc.

• He finally faced up to his drug problem when his band told him to shape up or ship out.

improve

im·prove [improve improves improved improving]   [ɪmˈpruːv]    [ɪmˈpruːv]  verb intransitive, transitive
to become better than before; to make sth/sb better than before
• His quality of life has improved dramatically since the operation.
• The doctor says she should continue to improve (= after an illness).
• I hope my French will improve when I go to France.
• ~ sth to improve standards
• The company needs to improve performance in all these areas.
• I need to improve my French.
Derived: improve on something
Verb forms:

 
Word Origin:
early 16th cent. (as emprowe or improwe): from Anglo-Norman French emprower (based on Old French prou ‘profit’, ultimately from Latin prodest ‘is of advantage’); -owe was changed to -ove under the influence of prove. The original sense was ‘make a profit, increase the value of’; subsequently ‘make greater in amount or degree’.  
Thesaurus:
improve verb
1. T
• The graphics on the website have been greatly improved.
reform • • refine • • enhance • |written enrich •
formal Opp: impair
improve/refine/enhance/enrich your understanding
improve/refine/enhance your knowledge
improve/enhance/enrich your life
2. I
• His quality of life improved after the operation.
pick up • • advance • • progress • • develop • • get better • |informal look up • • come along/on •
Opp: worsen, Opp: deteriorate
start/begin/continue to improve/pick up/advance/progress/develop/get better/look up
fail to improve/advance/progress/get better
improve/pick up/advance/progress/develop/get better slowly/gradually/slightly/dramatically  
Example Bank:
• The situation has improved dramatically during the last few months.
• The weather should continue to improve over the weekend.
• They are trying to improve the working conditionsin their factories.
• This legislation will vastly improve the quality of life of New Zealanders.
• We now offer a much improved service to our customers.
• Workers need to be given an incentive to improve their performance.
• Working and living conditions have generally improved.
• measures aimed at improving government efficiency
• the new and improved version of the website
• trying to improve their working conditions
• Bringing the issue of pay into the debate did not improve matters.
• My father's mood had noticeably improved during the afternoon.
• The company has greatly improved its performance over the past few years.
• The doctor says she should continue to improve.
• The economy had improved markedly.
• There have been renewed attempts to improve conditions for younger prisoners.
• They're introducing a vastly improved public transport system.
• We expect the situation to improve slightly.

• You can significantly improve your chances of getting a job by compiling a good