The link between a chair and bittersweet can vary based on the context in which the terms are used. "Bittersweet" can be used to describe a color, flavor, or emotional experience, while a chair is a piece of furniture designed for sitting.

When used together, "bittersweet chair" could refer to a chair that is colored or designed with bittersweet hues, providing a warm and inviting aesthetic. Alternatively, it could refer to a chair that has emotional significance, where sitting in it brings up both happy and sad memories. The exact link between a chair and bittersweet would depend on the specific context in which the terms are used.