catchphrase

Frequently, catch phrases are not, in the grammarians' sense, phrases at all, but sentences. Catch phrases, like the closely linked proverbial sayings, are self-contained, as, obviously, clichés are too. Catch phrases are usually more pointed and ‘human’ than clichés, although the former sometimes arises from, and often they generate, the latter. Occasionally, catch phrases stem from too famous quotations.