be not long for this world
To be approaching death. Mabel is not long for this world—her health is rapidly declining. Those flowers are so wilted that they're definitely not long for this world.
not be long for this world
have only a short time to live. 1996 Frank McCourt Angela's Ashes Mrs. Finucane…says she's not long for this world and the more Masses said for her soul the better she'll feel.