rush, hurry, be flustered
怱 centers on a state of hurried agitation: rushing, being in a hurry, or feeling flustered and unsettled.
怱 combines 匆 (hurried) with 心 (heart/mind), suggesting a heart that is hurried or flustered. The exact historical development is uncertain, but the component relationship is consistent with the meaning.
The top part 匆 looks like a person rushing with a bundle, and the bottom 心 is the heart. Imagine your heart racing as you hurry and feel flustered.
For ソウ, picture a flustered person rushing to sew a torn sleeve: sew -> ソウ, and the hurried sewing matches the kanji's meaning.