to (one's) cost
(redirected from to her cost)to (one's) cost
To one's detriment; due to one's personal experience with something negative. Unfortunately, he's not as forgiving as we all had thought, as I found out to my cost.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
to your ˈcost
(know, discover, etc. something) because of something unpleasant that has happened to you: Joanne’s not a very reliable person, as I’ve recently discovered to my cost.Farlex Partner Idioms Dictionary © Farlex 2017