security-blanket

security blanket

noun
1.
a blanket or other familiar item carried especially by a young child to provide reassurance and a feeling of psychological security.
2.
someone or something that gives a person a sense of protection or a feeling of security: His wealthy uncle is his security blanket.

Origin:
1965–70

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
security blanket
 
n
1.  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
2.  a baby's blanket, soft toy, etc, to which a baby or young child becomes very attached, using it as a comforter
3.  informal anything used or thought of as providing reassurance

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