What does tipping out mean?

I keep seeing to top out with a foam brush for the epoxy finish. Surely I'm looking in the wrong places but I can't figure out what this means anywhere on the internet. 

   Apologies for the double post--somehow hit the button twice. 

   The recent thread on "varying epoxy textures" has a discussion of tipping.  

Thanks--I'll put it here also for posterity:

Tipping out is LIGHTLY brushing the epoxy with the tip of a new, clean brush. The aim isn't to push the glue around, but rather just break the surface tension, popping any bubbles and helping the film to settle more evenly.