Dictionary / Vocabulary / ご苦労
ごくろう
trouble (I have put you through); (your) hard work; thank you (for your hard work); I appreciate your efforts
Also written 御苦労
私たちがおかけしたご苦労に対してどうしたら償いができるでしょう。
How can we make it up to you for all that you have suffered because of us?