Bar None British slang
Nothing/ no one else is better.
She is the most beautiful girl I have ever met in my life, bar none.
This is the most interesting film that I have ever watched, bar none.
To become better
We should be careful in doing everything instead of doing something risky.
Used to to emphasize that attention is paid to the individuals who complain or cause problems
Sometimes, you shouldn't be so quiet because the squeaky wheel gets the grease.