The noun מזימה (conspiracy/plot) is derived from the verb זמם (conspiring), which can sometimes be for good and sometimes for evil. And the noun זימה (lewdness) in particular specifies the immersion of one’s thoughts into sin and immorality. And in the Torah, this noun is only found with respect to the profanity of one’s daughter with immorality⁷²⁸ and the uncovering the nakedness of a woman and her daughter⁷²⁹.

footnotes: ⁷²⁸ Leviticus 19:29. ⁷²⁹ Leviticus 18:17.

And matters of immorality come in the Scripture in a special language– תועבה (abomination), זימה (lewdness), חסד (shameful), etc., and each one is needed for a special homiletical interpretation.

And all immorality uses the language שכיבה (lying down), and lying with one’s sister or the wife of one’s brother uses לקיחה. And there is a reason for this in accordance with its simple meaning. And with respect to uncovering the nakedness of a woman and her mother, it also uses לקיחה, and there is something special to learn from this.

Leviticus 20:14 says,ואיש אשר יקח את אשה ואת אמה זמה הוא באש ישרפו אתו ואתהן ולא תהיה זמה בתוככם(And if a man take with his wife also her mother, it is wickedness: they shall be burnt with fire, both he and they; that there be no wickedness among you.), using the verbיקחfor “take”. This is to teach that the man is liable only because he married a woman and then lay with her daughter. But if he had forced or seduced a woman and then lay with her daughter, the verse would not pertain to him⁷³⁰.

footnotes: ⁷³⁰ Malbim, HaTorah v’HaMitzvah Kedoshim 110.