He tries to keep his private life and public life 'separate' (from each other). = He tries to keep his private life 'separate' from his public life.
('US') He fell and 'separated' [='dislocated'] his shoulder. [=caused the bone in his shoulder to move out of its proper position]
The competition has been easy to this point, but now it gets tough and we'll really begin to 'separate the men from the boys'.
(..) I'm Edward Cullen. You're Bella? Yes. Onion root tip cells, that's what's on your slides right now. Okay? So, separate and label them into the phases of mitosis, and the first partners that get it right are gonna win the Golden Onion. All right, good. Ladies first. (..)2008 Twilight