be in a world of (one's) own(redirected from are in a world of their own)
be in a world of (one's) own
To be consumed by one's thoughts, imagination, etc., to such a degree that one is unaware of or insensitive to one's surroundings and/or the outside world in general. When she starts writing, Helen is in a world of her own, and it's very difficult to get her attention.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
be, live, etc. in a world of your ˈownseem not to be aware of things happening around you; be a person who has ideas that other people think are strange: I’m not surprised he didn’t know about it — he lives in a world of his own, that boy.
Farlex Partner Idioms Dictionary © Farlex 2017