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.
(..) - What kind of game? - I called it baby crepe. - I don't think I know that one. - It's quite ingenious. You get down here on the floor and then you roll him up in a blanket... and then you pull it back and forth and back and forth. He loved it. He did not cry. He smiled, he giggled. He was having the time of his life. And then, I pulled back the blanket a little too hard... and he rolled under the bed, and he got stuck. My God! I tried to get him out, but he wouldn't grab the string. (..)2004 TvShow: Gilmore Girls Title: The Nanny and the Professor Season: 4 Episode 10