shibboleth
/ˈʃɪbəleθ/noun
- a custom, principle, or belief distinguishing a particular class or group of people, especially a long-standing one regarded as outmoded or no longer important过时的风俗（或准则、信仰）：
Labour's socialist shibboleths.
工党过时的社会主义信仰。
词源
mid 17th cent.: from Hebrew šibbōleṯ 'ear of corn', used as a test of nationality by its difficult pronunciation （Judg. 12:6）.