ごくろう
trouble (I have put you through); (your) hard work; thank you (for your hard work); I appreciate your efforts
JLPT N3 Also written 御苦労
Noun
Expression
私わたしたちがおかけしたご苦労くろうに対たいしてどうしたら償つぐな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?