shape up or ship out

Shape up or ship out.

Fig. Either improve one's performance (or behavior) or leave. (Used as a command.) Okay, Tom. That's the end. Shape up or ship out! John was late again, so I told him to shape up or ship out.
See also: out, shape, ship, up

shape up or ship out

INFORMAL
If you tell someone to shape up or ship out, you are telling them that they should improve their behaviour or performance, or else leave. Coach Kevin Wall has warned his players to shape up or ship out.
See also: out, shape, ship, up

shape up or ship out

in. improve or get out. I’ll tell you one more time. Shape up or ship out!
See also: out, shape, ship, up