The witness was given 'blanket' protection from prosecution. [=the witness would not be prosecuted for anything]
The job was her 'security blanket'. [=the job was the thing that made her feel safe and secure]
A 'blanket' of gloom spread over the crowd when they realized their team would lose.
(..) useful things together. I'm sure that in all America there's no empathicalist as charming as you. Well, I hate to throw a wet blanket... Darling, guess who this is. You'll never guess! - Your brother? - Professor Flostre. - This is Dick Avery. (..)1957 Funny Face