https://en.wikipedia.org/wiki/Thought_Reform_and_the_Psychol...
"The language of the totalist environment is characterized by the thought-terminating cliché. The most far-reaching and complex of human problems are compressed into brief, highly reductive, definitive-sounding phrases, easily memorized and easily expressed. These become the start and finish of any ideological analysis"
Examples of such phrases might be encountered in political protests by activists. The phrases can be mainly for the members of the group particularly the call and response type.
Lifton's book explains some other factors of such societies which I think can help identify whether a group is more like a cult: Leaders control information, hidden knowledge, demand for purity, confession of "sin", truth deciders, language control, doctrine > persons, only the in group are awakened.