UP

[labbasgle]

29, 34, and 37 match.
part of the words in 40 match.
I have something else for 45.
And I didn't have the other three - I missed some good ones!

[Becky]

26. fess up ??
40. just make it up as we go along
45. dried up
49 belly up to the bar

[labbasgle]

All good!

[Becky]

47. up to the limit

[labbasgle]

Yep

[Becky]

22. up to par
24. up with people

[labbasgle]

Two good ones.

[Becky]

5. I wonder what they're up to

[labbasgle]

That's it

[Becky]

15. he just up and left

33. getting up in years

52. barking up the wrong tree

up lifting ?

Chalk it up to inexperience ??

[labbasgle]

I don't have uplifting or chalk it up but the others match.

Will add clues later, storm is moving in.

[Becky]

1. up the down staircase
10. up for anything
17. we got my computer up and running again
20. up on the housetop reindeer pause
30. my mind is made up
32. let's pick up where we left off
23. up where we belong
36. let me make it up to you
48. fill 'er up please
50. things are looking up
51. work up a good sweat

[labbasgle]

Yes, yes, yes... yes!

[Becky]

18. he left xxxxxx up in the air ?????
19. up lighting ?????
23. up where we belong
44. take up or make up ????
up mood

up before dawn

[labbasgle]

Good ones. close enough on 18.

Two left - I added hints.