Slough of despond

"The road is winding, and consists of a succession of short, steep descents, diversified by occasional sloughs, which might well be called "sloughs of despond," into one of which Manuel was thrown rather unceremoniously, by the bursting of his saddle-girths at the top of one of these short hills, by which means he took a flight over the head of his beast, and found a soft resting place in the mud at the bottom."

"Amy laughed too, and, kissing her mother, said, 'Well, I never had such a "Day of Misfortunes" as Rosamund's. I think it is because I have got such a dear darling mother that she helps me out of my troubles, my "Sloughs of Despond," as Clara calls them, quicker.' / 'The best thing is to try not to fall into sloughs of despond, and the way to do that is to examine carefully how you have come to get into them.[…]'"