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1. Origins, structure, and basic meaning

• Structure: 叔 is used in kinship terms associated with siblings younger than one's parent; its on-reading is しゅく.
• Basic usage: 叔父さん is read おじさん, and 叔母さん is read おばさん.

2. Common pitfalls and similar expressions

• Matching Korean kinship terms
  • 叔母さん can refer both to one's mother's younger sister and to the wife of one's father's younger brother. Korean uses different kinship terms depending on the precise family relationship.