"trivial, idle, or worthless talk," 1550s, a varied reduplication of prattle. Also from 1550s as a verb.
mid-15c., discanten, "to run a variety with the voice in harmony with a musical theme, sing in counterpoint," from descant (n.). Sense of "to comment at length, make copious and varied comments" is attested by 1640s.
1894, a slang word but the earliest uses are unclear as to sense, perhaps a varied reduplication of jazz (n.). The word had early associations with jazz, which by the 1930s had become disparaging, "old-fashioned jazz," especially in contrast to swing.
The exact measure varied from place to place and according to commodity, and though in 19c. in Britain it acquired a precise legal definition, it varied in U.S. from state to state. Used since late 14c. loosely to mean "a large quantity or number." From late 14c. as "a bushel basket." To hide (one's) light under a bushel is from Matthew v.15.