For on such occasions Nature has always something rare to show us, and the danger to life and limb is hardly greater than one would experience crouching deprecatingly beneath a roof.
It's an informal word that is used disapprovingly to mean " to talk about or describe someone or something in a favorable way for pay" . It's usually paired with the word for.
To save himself the trouble of drawing up a long list of all that he disliked, he disapproved of the whole, once for all, and shut them figuratively out of his life.