deep pocket

deep pocket idiom
Also, deep pockets. A source of substantial wealth or financial support, as in The college relies on the deep pocket of one particular alumna. This term alludes to money-filled pockets. [Slang; 1970s]

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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