The compound word 肃静 (sùjìng) is formed by combining two semantically similar characters to create a nuanced, reinforced meaning related to quiet and solemnity. The first character, 肃 (sù), carries the core ideas of solemnity, respect, and austere reverence. The second character, 静 (jìng), directly means quiet, calm, or stillness. When paired, they create a term that is stronger than mere silence; it describes a respectful or solemn quiet, often used as a command ("Silence!") in formal settings like ceremonies, libraries, or memorial halls, where the required silence is imbued with a sense of dignity and decorum. Thus, the formation is a coordinative compound where both elements contribute to an intensified, context-specific concept.