to take additional risks when things are going well
Dubya didn't remember what happens when you push your luck and as a result his popularity plummeted after he announced his idea about fighting terror.
1. Do not ask for anything more.
2. Do not ask for too much.
Don’t push your luck just because I took your case. You still owe me.
A phrase you tell someone when an extra concession, in addition to an existing concession, will be or likely be denied
Guy 1: Bro, can you do my homework?
Guy 2: OK fine, but you owe me one.
Guy 1: …and can you do my friends homework too?
Guy 2: Don’t push your luck.