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.
(..) - Where are you going? I just need to...talk about the...the rent. - I've still got questions. - Oh, what now?! I'm in shock - look, I've got a blanket. - Sherlock! - And... I just caught you a serial killer... more or less. OK. We'll pull you in tomorrow. (..)2010 TvShow: Sherlock Title: A Study in Pink Season: 1 Episode 1
(..) but there's still time to hurt you. Give me...a name. A name! Now! The name! Moriarty! Why have I got this blanket? They keep putting this blanket on me. - Yeah, it's for shock. - I'm not in shock. Yeah, but some of the guys want to take photographs. (..)2010 TvShow: Sherlock Title: A Study in Pink Season: 1 Episode 1