To practice music by oneself, usually with special care to be kept from being disturbed. Theoretical etymology: Shortened from the word woodshed, where the idea was in order to not only be alone to concentrate, but to refrain from disturbing other people, one would have to retire to the woodshed to practice.
My chops are not what they used to be. I need to go shed.
Man, these parts are crazy hard. I need to go shed them.
I've been shedding all week Michael Brecker's pentatonic concepts. You've been warned.