Hold Up Meaning

(transitive) To impede; detain.

Example:   What is holding up traffic?
  Hold up a minute. I want to check something.
To support or lift.
  Hold up the table while I slide this underneath.
1977, Agatha Christie, An Autobiography, Part II, chapter4:
  Mind you, clothes were clothes in those days. […]  Frills, ruffles, flounces, lace, complicated seams and gores: not only did they sweep the ground and have to be held up in one hand elegantly as you walked along, but they had little capes or coats or feather boas.
  hold up to scrutiny
  hold up to heavy use
  I don't think he's holding up his end of the bargain.
  The guy tried to hold up a bank.
  I've got to be to work now. Why are you holding me up?
2012 May 13, Andrew Benson, “Williams's Pastor Maldonado takes landmark Spanish Grand Prix win”, BBC Sport:
  It worked to perfection. Ferrari's decision not to stop on the next lap simply made life easier, especially when Alonso was held up by Marussia's Charles Pic during that period - for which the Frenchman earned a drive-through penalty.
To keep up; not to fall behind; not to lose ground.
  (Can we find and add a quotation of Collier to this entry?)