sudden infant death syndrome       
noun [ U ] uk/ˌsʌd.ən ɪn.fənt ˈdeθ ˌsɪn.drəʊm/ us/ˌsʌd.ən ɪn.fənt ˈdeθ ˌsɪn.droʊm/ (abbreviation SIDS)
 婴儿猝死综合征
a medical condition in which a baby who is sleeping dies suddenly for no obvious reason
 Synonyms: cot death crib death