From Longman Dictionary of Contemporary Englishsecurity blanketseˈcurity ˌblanket noun [countable] 1 DHTa piece of material that a child likes to hold, to comfort himself or herself2 something that you have had for a long time, and that you use to make yourself feel less anxious
Examples from the Corpus
security blanket• All these controls can be turned off, but they do form a comforting security blanket.• The veil was her security blanket.• Tokyo was my security blanket, the only stability I had known.• A friend knitted me a fabulous Nordic jumper, which immediately took on the status of security blanket.• Computer customers no longer need the security blanket of a brand name. 