do by

do by idiom
Behave with respect to, treat, as in John was determined to do well by his children. This idiom was first recorded about 1175.

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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