security blanket

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From Linus van Pelt's security blanket in Charles Schulz's comic strip Peanuts


security blanket (plural security blankets)

  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.
    That rabbit's foot is his security blanket.