What is the term for pouring liquor from one bottle into another?

The term used for pouring liquor from one bottle into another is "Marriage of Liquor." This term specifically refers to the practice of combining different spirits or liqueurs, which may involve blending various brands or types to create a new flavor profile or to mix older stock with newer for consistency in taste. This is a common practice among distillers and bartenders who want to maintain or enhance the taste of their products through a careful selection of different liquors.

On the other hand, blending generally refers to mixing different components to enhance flavors, but it’s not specifically about the action of transferring from one bottle to another. Transferring is a more general term that doesn't convey the idea of combining two different products. Decanting usually pertains to wines, where the liquid is poured from one container into another, often to separate sediment from the liquid, but it does not imply the combining aspect that "Marriage of Liquor" does.