it is incumbent upon/on somebody to do something formal RESPONSIBLEif it is incumbent upon you to do something, it is your duty or responsibility to do it 做某事是某人的职务[责任] 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 is incumbent upon/on somebody to do something at incumbent2(1)