What is the meaning of "Al-Sudud Al-Bayn"?

Perhaps the questioner means the blockage of the wife's private part, which prevents intercourse, and this is what jurists call "ratq" (atresia). Mukhtasar Khalil mentioned that "ratq" is one of the defects that give the husband the option to separate from his wife or to remain with her. Al-Dardir defined it as "the closure of the passage for the male organ such that intercourse is not possible."