The word 密切 is formed through the conceptual combination of its two component characters: 密 (mì), meaning "dense", "close", or "intimate", and 切 (qiè), meaning "to cut", "close to", or "keenly". Together, they create a metaphorical blend where 密 provides the sense of tightness and absence of gaps (as in a dense forest or close relationship), and 切 adds the dimension of precise, direct contact or pressing together (as with a blade cutting exactly or being closely connected). This fusion visually and notionally paints a picture of two things being inseparably close, interlocked, or in thorough contact, thereby conveying meanings like "close", "intimate", or "carefully".