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Longman Dictionary of Contemporary English
security blanket
noun
EXAMPLES FROM OTHER ENTRIES
▪ Computer customers no longer need the security blanket of a brand name.
EXAMPLES FROM CORPUS
▪ A friend knitted me a fabulous Nordic jumper, which immediately took on the status of 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.
Wiktionary
security blanket

n. 1 A blanket that one uses to have a secure feeling or reduced anxiety, usually in the early years of life: ''Linus van Pelt had a famous '''security blanket'''.'' 2 Any object one uses to have a sense of security or reduced anxiety.

WordNet
security blanket
  1. n. anything that an adult person uses to reduce their anxiety

  2. a blanket (or toy) that a child carries around in order to reduce anxiety

Usage examples of "security blanket".

Micah caught up with me, his arm sliding around my waist like I was his new security blanket.

No longer covered by the security blanket of the ice storm, the wind having dropped to only five miles an hour, Cleary felt naked, as his white-clad force fanned out and began advancing toward the mining facility.

There had always been tension, especially at the beginning of his career, but he'd quickly grown confident in his fieldcraft, and the skills had become for him a kind of security blanket, whose warm folds had always made his soul comfortable.

If it was cowardice and a foolish security blanket to sleep with a light on, she could live with that.

Sprecher sat down at his desk and searched for his security blanket, the red and white pack of Marlboros.

He put on the life jacket he'd been clutch ing like a child's security blanket.

He ran out of the room and stormed through thefor some distance, going up several stairways, past severalHe stepped into another room, chosen at random, and foundfloor covered with cribs, evenly spaced in rows and columns,one containing a sleeping one-year-old, dressed in fuzzy pinkwith a hood and a set of mouse ears, each one clutching anwhite security blanket and nestled up with a stuffedHere and there, a young woman in a pink dress sat on theon a bamboo mat, reading a book or doing needlework.

He stepped into another room, chosen at random, and found the floor covered with cribs, evenly spaced in rows and columns, each one containing a sleeping one-year-old, dressed in fuzzy pink jammies with a hood and a set of mouse ears, each one clutching an identical white security blanket and nestled up with a stuffed animal.

He wanted to clutch at the things around him like a security blanket.