rush, hurry, be flustered
匆 centers on hurried, flustered action: rushing or being in a frantic hurry.
匆 is thought to be a simplified variant of 怱, which combines 心 (heart) with 匆 as a phonetic component. The modern form visually contains 勹 and inner strokes, but the exact historical development is uncertain.
The outer 勹 looks like a person bending over in a rush, and the inner dot and crossed strokes suggest hurried, flustered movement inside.
For ソウ, imagine someone rushing so fast they create a 'swoosh' sound: swoosh -> ソウ, as they hurry past in a fluster.