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WordReference English- Chinese Dictionary © 2020:
incumbent adj adjective: Describes a noun or pronoun--for example, "a tall girl," "an interesting book," "a big house." (person: current, in office) ( 人) 在位的，现任的
The incumbent mayor has done a good job in his time in office.
incumbent on [sb], incumbent upon [sb] adj + prep (obligatory for [sb]) 对...来说必须履行的
The duty of managing finances is incumbent on the organization's treasurer.
incumbent on [sb] to do [sth], incumbent upon [sb] to do [sth] expr expression: Prepositional phrase, adverbial phrase, or other phrase or expression--for example, "behind the times," "on your own." (obligatory for [sb]) 某人必须履行某事
It is incumbent on the bride's father to make a speech at the wedding.
incumbent n noun: Refers to person, place, thing, quality, etc. (person in office) 在位者，现任者
The incumbent wins in most elections.
incumbent on [sth], incumbent upon [sth] adj + prep archaic (resting on) 倚靠在...上
The man was incumbent on his bed.