American English

Definition of security blanket noun from the Oxford Advanced American Dictionary

     

    security blanket

     noun
    noun
     
     
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  1. 1a blanket or other object that a child holds in order to feel safe
  2. 2something that provides protection against attack, danger, etc. A firewall provides an essential security blanket for your computer network.
See the Oxford Advanced Learner's Dictionary entry: security blanket