Noun
trouble (I have put you through); (your) hard work
Polite (teineigo) languagesee 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? Expressions (phrases, clauses, etc.)
thank you (for your hard work); I appreciate your efforts
usu. to one's subordinatesee ご苦労さま
Also written 御苦労【ごくろう】