saviour sibling Meaning in the Cambridge English Dictionary
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Meaning of “saviour sibling” in the English Dictionary

"saviour sibling" in British English

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saviour siblingnoun [C]

UK (US savior sibling) uk   us  
a ​child who is ​born with ​particular genes that have been ​chosen in ​order to ​treat an ​olderbrother or ​sister who has a ​disease
(Definition of saviour sibling from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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