Definition of "comedown"

He had two subjects of conversation, the shame and come-down of being a tramp, and the best way of getting a free meal.

1933 January 9, George Orwell [pseudonym; Eric Arthur Blair], chapter XXVIII, in Down and Out in Paris and London, London: Victor Gollancz […]

I have to say it again, my Dearest Friend. What a wonderful Comedown for the Godhead! What a wonderful Comeuppance for Humankind! That’s because You, Lord God, Creator, Bellows Maker of All That Breathes, deigned to come to my hovel of a soul; once there, to fatten up the leanness of my soul with the plumpitude of Your Sacrament; that’s to say, with the plenitude of Your Divinity and Humanity.

2000, Thomas à Kempis, “[The Sacrament of the Altar: How to Prepare for It & What It Tastes Like] Frequency”, in William Griffin, transl., The Imitation of Christ: How Jesus Wants Us to Live […] A Contemporary Version, HarperSanFrancisco, page 238

“So how are you getting on at UCL?” said Penny kindly, as if it must be a sorry comedown after Oxford.

2004, Alan Hollinghurst, chapter 5, in The Line of Beauty […], 1st US edition, New York, N.Y.: Bloomsbury Publishing