in trust

in trust idiom
In the possession or care of a trustee, as in The money was held in trust for the children's education. This expression implies having confidence in someone (the trustee). [Mid-1500s]

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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