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.
(..) CCCCuuutt itt, SSySirr. - You've gotta cut it! - l don't even know if this is the right wire. Choose. Just choose a wire and cut it. Get a blanket! Dade, get a blanket for Lieutenant! Sarge! Sarge! lt's over, Sir! lt's over! - Jerry's surrendered! - Yeah-ha! Sir, congratulations. Kip? Kip? (..)1996 The English Patient