/’mɛrɪzəm/  |  MAIR-iz-mm

Where a synecdoche is a specific type of metonym, a merism is a specific type of synecdoche in which a phrase refers to something by the name of a few of its components (usually two in contrast).  Like other metonyms, their usage most often comprises pre-established terms (such as saying “high and low” or “near and far” to mean “everywhere“), rather than existing in unique cases.

Other examples:

• The slog can corrode you, mind and body.  [Referring to the ‘whole of a person’ to mean completely]
• Don’t let the slog waste your blood, sweat, and tears.  [Referring to products of ‘bodily exertion’ to mean hard work]
• Being the worst is the slog‘s bread and butter.  [Referring to ‘basic needs’ (by way of food) as a function of their acquisition to mean manner of supporting oneself]

Merism.  Use it.

Bene scribete.