look of rumpled feathers, bedraggled, hasty, rapid flight
翛 centers on a disheveled, hurried state, especially of feathers or flight: rumpled, bedraggled, hasty, or rapid movement. The meanings connect through the image of something rushed and untidy.
翛 combines 羽 (feathers) with 攸, which likely contributes the sound. The character is associated with the appearance of feathers and rapid movement, but the exact historical development is uncertain.
Feathers (羽) under a rushing wind (攸) become rumpled and bedraggled, suggesting a hasty, rapid flight.
For ショウ, imagine a bird with rumpled feathers taking off in a sudden show of rapid flight: show -> ショウ.