SHIBBOLETH
shibboleth
(noun) a manner of speaking that is distinctive of a particular group of people
motto, slogan, catchword, shibboleth
(noun) a favorite saying of a sect or political group
Source: WordNet® 3.1
Etymology
Noun
shibboleth (plural shibboleths)
A word, especially seen as a test, to distinguish someone as belonging to a particular nation, class, profession etc.
A common or longstanding belief, custom, or catchphrase associated with a particular group, especially one with little current meaning or truth.
Synonyms: platitude, slogan, truism
Source: Wiktionary
Shib"bo*leth, n. Etym: [Heb. shibboleth an ear of corn, or a stream,
a flood.]
1. A word which was made the criterion by which to distinguish the
Ephraimites from the Gileadites. The Ephraimites, not being able to
pronounce sh, called the word sibboleth. See Judges xii.
Without reprieve, adjudged to death, For want of well pronouncing
shibboleth. Milton.
Definition: Also in an extended sense.
The th, with its twofold value, is . . . the shibboleth of
foreigners. Earle.
2. Hence, the criterion, test, or watchword of a party; a party cry
or pet phrase.
Source: Webster’s Unabridged Dictionary 1913 Edition