rub in

rub in idiom
Also, rub it in. Harp on something, especially an unpleasant matter, as in She always rubs in the fact that she graduated with honors and I didn't, or I know I forgot your birthday, but don't keep rubbing it in. This idiom alludes to the expression rub salt into a wound, an action that makes the wound more painful; it dates from medieval times and remains current. [Mid-1800s] Also see rub someone's nose in it.

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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