Why does Katherine tie bianca's hand?

Katherine ties Bianca's hand in Shakespeare's "The Taming of the Shrew" as part of her attempt to assert dominance and control over her sister. This act illustrates the tension between the sisters, highlighting Katherine's frustration with Bianca's more favorable treatment and social expectations. It also serves to demonstrate Katherine's rebellious nature and her struggle against the constraints placed on women in their society. Overall, this moment encapsulates the themes of power dynamics and gender roles in the play.