Curtsy is a traditional greeting etiquette, and women should kneel and nod when they salute.
The squat and bow of the body indicate obedience, and the action of touching the chest with the right hand indicates sincerity and effectiveness.
Loyalty is also defense. The posture of landing on one knee retains the ability to fight back against the subject.
The information conveyed by curtsy is multiple, including submission, loyalty, defense and counterattack.