The word "器宇轩昂" is formed by combining the two-character compound "器宇", which refers to a person's demeanor or appearance, with the two-character compound "轩昂", meaning lofty and spirited. Each character contributes directly: "器" denotes capacity or bearing, "宇" adds the sense of outward presence, "轩" conveys height or dignity, and "昂" indicates an uplifted or proud state. The idiom's meaning arises from this sequential pairing, where the first phrase describes the aspect of bearing and the second emphasizes its elevated quality.