take into one's confidence


Trust someone with a secret, as in She took me into her confidence and admitted that she was quitting next month. This idiom uses confidence in the sense of “trust,” a usage dating from the late 1500s.

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The American Heritage® Idioms Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.