It is incumbent upon yourself to do an answers.com check in future:  I did it just because I was curious.\n\nImposed as an obligation or duty; obligatory: felt it was incumbent on us all to help.\nLying, leaning, or resting on something else: incumbent rock strata.\nCurrently holding a specified office: the incumbent mayor.\nn.\nA person who holds an office or ecclesiastical benefice: The incumbent was reelected to another term.\n\n\n[Middle English, holder of an office, from Medieval Latin incumbēns, incumbent-, from Latin, present participle of incumbere, to lean upon, apply oneself to : in-, on; see in–2 + -cumbere, to recline