harass, bother, annoy, disturb, agitate, sad, grieved
騷 centers on stirring up trouble or inner turmoil: harassing, bothering, agitating, or feeling sad and grieved. The meanings range from external disturbance to internal distress.
騷 is the traditional form of modern 騒. It combines 馬 (horse) with 蚤 (flea), suggesting the restless agitation of a horse bothered by fleas, extended to emotional disturbance.
A horse 馬 with a flea 蚤 on it becomes restless and agitated, kicking up a disturbance. That agitation can also feel like sadness or grief.
For ソウ, imagine the horse making a low, sad sound: 'sou...' as it is bothered by the flea. The sound 'sou' cues ソウ while the horse is harassed.