noun
a slogan or catchword used by a particular party or group to represent their beliefs or values
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The use of a particular phrase or word can sometimes act as a shibboleth within a specific community.
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Knowing the shibboleth of a group can help you fit in better.
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If you don't know the shibboleth, you might stick out like a sore thumb.
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In some cultures, wearing a certain type of clothing can serve as a shibboleth to identify one's social status.