v. phr. , informal To either improve one's disposition or behavior, or quit or leave. When Paul neglected to carry out his part of the research work that Professor Brown had assigned him with for the fifth time, the professor cried, "Shape up, or ship out, Paul. I have lost my patience with you!"
SHAPE UP OR SHIP OUT
Meaning of SHAPE UP OR SHIP OUT in English
American idioms English vocabulary. Английский словарь американских идиом. 2012