be the making of

be the making of idiom
Be the means or cause of progress or success, as in Marriage will be the making of him. This idiom, using making in the sense of “advancement,” was first recorded about 1470.

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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