A more thorough explanation:

Married woman's separate estate in equity is a legal concept that originated in common law. It refers to a trust that a wealthy family could establish for their daughter to protect her money and property from her husband's control. This was important because, under the law of coverture, a married woman had no legal rights to her own property or income.

With a separate estate in equity, a married woman could retain control of her own money and property, even if her husband was named as the trustee. This allowed her to have financial independence and security, which was especially important in a time when women had limited opportunities for employment and were often dependent on their husbands for support.

For example, let's say that a wealthy family sets up a separate estate in equity for their daughter, Jane. The trust is funded with money and property that Jane will inherit from her parents. Even if Jane gets married, her husband will not have control over the trust. Instead, Jane will be the beneficiary and can use the income from the trust for her own needs.

The concept of a separate estate in equity was an important step towards granting married women more legal rights and protections. It paved the way for later reforms, such as the Married Women's Property Acts, which gave women more control over their own property and income.