dried meat
脩 centers on dried meat as a preserved food. The meaning is narrow and concrete, without strong abstract extensions.
脩 combines the flesh radical 月 with 攸, which likely contributes the sound. The character originally referred to dried meat strips, and the component 攸 may have been chosen for its phonetic value.
The left side 月 (flesh) and the right side 攸 (which looks like a person with a stick) suggest meat being prepared and hung to dry. Picture strips of meat drying on a rack.
For シュウ, imagine a chef saying 'shoo!' as he waves away flies from the drying meat: 'shoo' -> シュウ, keeping the dried meat clean.