n. 在职者，现任者〔尤指政治职位〕
a. 在职的；现任的
a. 有责任；必须履行
it is incumbent upon/on sb to do sth 做某事是某人的职务[责任]
the incumbent president/priest/government 现任总统/现任牧师/本届政府
It is incumbent upon parents to control what their children watch on TV. 控制孩子看什么样的电视节目是父母的责任。
It was incumbent on them to attend. 他们必须出席。
BrE /əˌbriːviˈeɪʃn/