The term "close quarters" refers to a situation where people or things are in very close proximity, often with limited space for movement. It can be used literally to describe tight spaces such as small rooms, tunnels, or narrow passages, where individuals may feel cramped and uncomfortable due to the lack of personal space. Figuratively, it can also refer to a situation in which people are forced into close contact with each other, often under stressful circumstances, such as during combat or confined spaces. In essence, "close quarters" implies that there is little room for maneuverability and individuals must adapt to the limited space available.