"felt obligated to repay the kindness"; "was obligated to pay off the student loan"
is similar to
under a moral obligation to someone
is similar to
under a moral obligation to do something
is similar to
owing gratitude or recognition to another for help or favors etc
is similar to
under a legal obligation to someone
is similar to
required or under orders
"I'm supposed to be there at ten"; "he was supposed to go to the store"
is similar to
paying tribute
"a tributary colony"
see also
worthy of or requiring responsibility or trust; or held accountable
"a responsible adult"; "responsible journalism"; "a responsible position"; "the captain is responsible for the ship's safety"; "the cabinet is responsible to the parliament"