The kanji 襟襟 primarily signifies "collar," the part of a garment that surrounds the neck. It refers to the edge of a shirt, coat, or other clothing item that fits around the neck. It can also figuratively refer to the area around the neck.

・On-yomi (音読み): キン (kin) ・Kun-yomi (訓読み): えり (eri)

⚫︎ 襟（えり）が汚（よご）れている。 Translation: The collar is dirty. ⚫︎ 襟（えり）を正（ただ）す。 Translation: To straighten one's collar (figuratively: to compose oneself, to be serious). ⚫︎ 学生服（がくせいふく）の襟（えり） Translation: The collar of a school uniform.

The kanji 襟襟 is a phono-semantic compound (形声文字). The left side is a radical called "衣" (ころもへん, "clothing" radical), indicating that the character relates to clothing. The right side is 金 (kin, meaning "gold" or "metal" in certain contexts), which is used phonetically to indicate the sound of the character. Together, they create the meaning of "collar" or "neckband," as a specific part of clothing. The inclusion of the "gold" radical in its formation might imply a reference to embellishments, decoration, or the value associated with the garment's collar in the past.