social insurance
noun [ U ] uk/ˌsəʊ.ʃəl ɪnˈʃɔː.rəns/ us/ˌsoʊ.ʃəl ɪnˈʃɔːr.əns/
（美国的）社会保险
(in the US) money that employers and employees pay to the government so that people receive money when they are not able to work because of age, illness, etc.