security blanket
noun
1
- a blanket or other familiar object which is a comfort to someone, typically a child安乐毯(使某人, 尤其使小孩感觉舒适的毯子等熟悉物件)。
2
- Brit. an official sanction imposed on information in order to maintain complete secrecy about something〈英〉(为保密而进行的)新闻检查。