The definition of beholden is you owe someone, or are under some moral obligation to repay a favor or kindness.
When your in-laws give you the money to buy a house and keep bringing it up every time they ask if they can come over, this is an example of a time when you might feel beholden.
archaic pp. of behold
Origin of beholdenME, past participle of behold
obliged to feel grateful; owing thanks; indebted
Owing something, such as gratitude, to another; indebted.
Origin of beholdenMiddle English biholden past participle of biholden to observe ; see behold .