Meaning: under a moral obligation to someone
It was still a trouble to him to think that he should have been in any way beholden to John Grey; but the terrible thing had been done, the evil had occurred.
By my faith, said Arthur, they are two marvellous knights, and namely Balin passeth of prowess of any knight that ever I found, for much beholden am I unto him; would God he would abide with me.
Then King Howel embraced him in his arms, and said: Sir Tristram, all my kingdom I will resign to thee. God defend, said Sir Tristram, for I am beholden unto you for your daughter's sake to do for you.