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.
(..) this afternoon in the Southland. The LAPD rescued a local man from the Hollywood sign, the city's only real landmark. They actually wrapped you in a foil blanket! Did you run a marathon before this? - Okay. Give me... - No! - No, no. I wanna save it. I gotta save it. - No. That's enough! (..)2011 Friends with Benefits