keep your end up
keep (one's) end up
To do as was promised in an agreement or bargain; to carry through with what one agreed to do. OK, I've delivered the cash as you instructed. Now you have to keep your end up! My dad said he'd buy me a car if I got a 4.0 this semester, so I've got to ace this test if I want to keep my end up.
keep your end upor
hold your end upBRITISH, INFORMAL
If you keep your end up or hold your end up in a particular situation, you do what you have promised to do or what you are expected to do. But David, despite being nervous, holds his end up brilliantly, making his points clearly and concisely. We signed a contract and we've worked hard to keep our end up. Now they must do the same.