hit somebody where it hurts

hit (one) where it hurts (most)

To attack one in the area that is most vulnerable or that will result in the most harm. Usually does not refer to physical violence. By questioning his parenting, Gina hit Ken where it hurt most. The best way to take down the cartel is to hit them where it hurts most—in their bank accounts.
See also: hit, hurt
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

hit somebody where it ˈhurts

affect somebody where they will feel it most: After four years of marriage, she really knows how to hit him where it hurts, and isn’t afraid to do it either.
See also: hit, hurt, somebody
Farlex Partner Idioms Dictionary © Farlex 2017
See also: