What is the exact meaning of "Latzbos Beten v'Lanpil Yarech"?
Rashi: It means to cause the stomach to swell and the thigh to fall off. 1
Whose "Beten" and "Yarech" is the Pasuk referring to?
Since we already know that this happpens to her from Pasuk 21, which specifically states "your thigh" and "your stomach". Targum Yonasan actually learns that the adulterer dies just like the Sotah in Pasuk 27.
Moshav Zekeinim (18), Da'as Zekeinim (24): A support is "ha'Me'arerim"; its Gematriya is 496, the number of limbs in two people. Da'as Zekeinim and the Ri asked, there are 252 limbs in a woman (Bechoros 45a)!
Why does the Sotah say word "Amen" twice?
Rashi: It is an acceptance of the Shevu'ah (and the curse): "Amen" on the curse, "Amen" on the Shevu'ah; "Amen" from this man, "Amen" from another man; 1 "Amen" that I did not sin whilst I was betrothed or Nesu'ah, a Shomeres Yavam or after Yibum. 2
Seforno: 'I accept the two conditions that you (the Kohen) stated: That if I did not go astray, I will be released from the sin of Shevu'as Shav; and if I went astray, the curse will take effect.
QUESTIONS ON RASHI
Rashi writes that Amen Amen is acceptance of the Shevu'ah, the curse, from this man, from another man, whilst I was betrothed or Nesu'ah, while Shomeres Yavam or after Yibum. How can we expound all this from one extra word?
Riva: The first Amen teaches the Shevu'ah, the curse, from this man, and from another man, even though it is not extra. All these are in the Parshah. The latter teaches during Eirusin or after Nisu'in, while Shomeres Yavam or after Yibum, for these are like one (the corresponding case of a Yevamah).