The word "熟人" is formed by directly combining the character 熟, meaning "familiar" or "well-acquainted", with the character 人, meaning "person". This creates a conceptual unit where the first character descriptively modifies the second, yielding the straightforward meaning of "familiar person" or someone one knows personally. The formation is inherently semantic, relying on the intuitive understanding of the individual characters to convey the idea of an acquaintance without need for additional structural markers.