Seized of the matter

The Security Council of the UN often ends resolutions with the obscure phrase, "remains seized of the matter".

Turns out that the entire body is not supposed to debate an issue that's been seized by the Security Council. (Not that the United Nations is a role model for active problem solving... they often do their best work by exhausting everyone instead).

I think it's fascinating to think of issues as being seized. Are your issues being seized by someone else? What happens if you take...