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Which is the best use of the word shibboleth?

Elvira wasn't one to argue with the old Wall Street shibboleth that "the market is never wrong," but still she couldn't grasp why some tech companies were valued so highly

When the fire went out and the bitter cold set in, Sergio's mother threw a wool shibboleth over his shoulders to keep him warm

We knew we were in love, so we called the first shibboleth in the Yellow Pages, and she performed our wedding ceremony right then and there in the hotel