saviour sibling
noun /ˈseɪvjə sɪblɪŋ/
/ˈseɪvjər sɪblɪŋ/
(also savior sibling)
- a child who is born through IVF in order to ensure that they have organs or cells that can be used to treat an older brother or sister with a serious medical condition
救命手足，兄姐救星（生下来是为了给患有重病的哥哥或姐姐提供器官或细胞移植的小孩，通过体外受精方式出生）