hold one's end up

hold (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 hold 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 hold my end up.
See also: end, hold, up
Farlex Dictionary of Idioms.

hold one's end up

to carry one's share of the burden; to do one's share of the work. You're not holding your end up. We're having to do your share of the work. Get busy. You have to hold up your end.
See also: end, hold, up
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs.

hold one's end up

Also, keep one's end up. Do one's share. For example, John always holds his end up, but Jerry is less reliable, or Let's hope she can keep up her end. In these expressions end alludes to one of two sides of something that must be lifted by two persons. [Mid-1900s]
See also: end, hold, up
The American Heritage® Dictionary of Idioms by Christine Ammer.
See also:
  • keep (one's) end up
  • keep end up
  • keep your end up
  • live up to (one's) end of the bargain
  • live up to (one's) side of the bargain
  • live up to end of the bargain
  • hold (one's) end up
  • hold end up
  • keep (one's) end of the bargain up
  • hold (one's) end of the bargain up