Definition: to find the solution to a problem, or manage to understand something.
(This verb has more than one meaning)
E.g.1. I can’t work out why my computer keeps crashing.
E.g.2. I can’t work this message out. What does ‘GR8′ mean? It means ‘great’ – you have to pronounce it!
This phrasal verb can be separated.
Source: Knights English