細嬸 [细婶]

Jyutping sai3 sam2
Pinyin xì shěn

Definitions (CC-CANTO)
  1. the wife of husband's younger brother
Definitions (粵典–words.hk)
  1. 名詞
    老公​個​細佬個​老婆
    the wife of one's husband's younger brother
Definitions (Kaifangcidian)
  1. 內弟媳 – 内弟媳
  2. 內弟婦 – 内弟妇