Mr. Micawber is a character in 'David Copperfield', a book by Charles Dickens. His name is used to describe a person who behaves in the same way. "Trust to fortune" means to accept everything which happens, in the hope that things will get better on their own. Fortune is the same thing as 'luck'. To idle means to be lazy. "Trust to fortune" means the same thing as "trust fortune", that is, t