shibboleth /ˈʃɪbəˌlɛθ, -ləθ/

• 1. 

  N-COUNT If you describe an idea or belief as a shibboleth, you mean that it is thought important by a group of people but may be old-fashioned or wrong. 过时的观点; 错误的信念 [正式]

  例：

  It is time to go beyond the shibboleth that conventional forces cannot deter.

  是时候摆脱那些传统力量无法阻止的旧观念了。