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English definition of “security blanket”

security blanket

noun [C]  /sɪˈkjʊər·ɪ·t̬i ˌblæŋ·kɪt/ us  
a small blanket (= bed cover) sometimes carried by a child to provide a feeling of safety A security blanket is also anything that you use or keep to make you feel safe: Having my brother at the same college gave me the security blanket I needed to leave home.
(Definition of security blanket from the Cambridge Academic Content Dictionary © Cambridge University Press)
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