- a blanket or other familiar item carried especially by a young child to provide reassurance and a feeling of psychological security.
- someone or something that gives a person a sense of protection or a feeling of security: His wealthy uncle is his security blanket.
- a policy of temporary secrecy by police or those in charge of security, in order to protect a person, place, etc, threatened with danger, from further risk
- a baby's blanket, soft toy, etc, to which a baby or young child becomes very attached, using it as a comforter
- anything used or thought of as providing reassurance
