The Chinese word 遗失 (yíshī), meaning "to lose" or "loss" (as in property), is a compound word formed by combining two semantically similar characters to create a more precise and formal term. The first character, 遗 (yí), carries meanings of "to leave behind," "to omit," or "to lose through neglect." The second character, 失 (shī), directly means "to lose," "to miss," or "to fail." When paired, they create a parallel or coordinative compound where both components reinforce and narrow the concept, with 遗 emphasizing the accidental or negligent aspect of leaving something behind, and 失 specifying the resultant state of being without it, together conveying the complete notion of losing possession of an item unintentionally.