1. (of a person) at the point of death: "on examination she was moribund and dehydrated"Similardyingexpiringon one's deathbednear deathnear the endat death's doorbreathing one's lastfading/sinking fastnot long for this worldfailing rapidlyon one's last legsin extremisinformal:with one foot in the graveOppositethrivingrecovering