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The American Heritage Dictionary of Idioms » security blanket
security blanket
security blanket idiom
Something that dispels anxiety, as in I always carry my appointments calendar; it's my security blanket. This colloquial term, dating from about 1960, was at first (and still is) used for the blanket or toy or other object held by a young child to reduce anxiety.
The American Heritage® Dictionary of Idioms by Christine Ammer. Copyright © 2003, 1997 by The Christine Ammer 1992 Trust. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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