The phrase "you know where you are with" means to know how one is regarded or perceived by someone, or to know one's position or views on a particular topic. It implies a sense of clarity, reliability, or certainty about a situation or relationship. For example, if you "know where you are with someone," it means you understand their expectations or feelings toward you, and there are no surprises. It can also mean something or someone is reliable, safe, and reassuring, as in "You know where you are with a Big Mac"—meaning it's a dependable choice.
This phrase is also used in cultural contexts, such as in the Radiohead song "Let Down," where the lyrics "You know, you know where you are with" suggest a sense of recognizing one’s situation or state of being, especially amid change or uncertainty.
