shibboleth

shib|bo|leth /ʃ'ɪbəleθ/ (shibboleths)
[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. (FORMAL)
It is time to go beyond the shibboleth that conventional forces cannot deter.

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