intransitive. With to, on, upon. Of a task, duty, burden, etc.: to be the responsibility of the specified person. Frequently with anticipatory it…

With to, †on, †upon. To be connected as a corollary, accompaniment, or consequence; (also) to fall as… intransitive. In general constructions.

To pass to the next in natural or conventional order. To fall as a duty or responsibility on or upon anyone.