be on the danger list

be on the danger list

To be so sick that one may die. Primarily heard in UK. Uncle Harry is still on the danger list, so we're going to visit him in the hospital tonight.
See also: danger, list, on

be on/off the ˈdanger list

(British English) be so ill that you may die; no longer be very ill: He’s been extremely sick, but thankfully he’s off the danger list now.
See also: danger, list, off, on