Merism

In law, a merism is a figure of speech by which a single thing is referred to by a conventional phrase that enumerates several of its parts, or which lists several synonyms for the same thing.

In rhetoric a merism is the combination of two contrasting words, to refer to an entirety. For example, when we mean to say that someone searched thoroughly, everywhere, we often say that someone searched high and low. The title of the tabletop role-playing game Dungeons & Dragons is also a merism. It refers to the game's fantasy theme. Another example of a merism the sword-and-sandal movie genre. It is a loose term for movies taking place in Classical antiquity which were made until 1970.