keep one's end of the bargain(live up to one's end of the bargain & keep one's side of the bargain & live up to one's side of the bargain & keep one's end of the bargain: to carry though on a bargain; to do as was promised in a bargain. • You can't quit now. You have to live up to your end of the bargain. • Bob isn't keeping his end of the bargain, so I am going to sue him. AI Alexander Demidov)
come up short on one's promises(But Washington has come up short on its promises to care for our veterans, sometimes because Congress didn't provide enough money... • NYC report says Verizon came up short on FiOS deployment promises.4uzhoj)