The structure of "dai" is an upper and lower structure. "Shuowen Jiezi" says: "Dai means gentry. Men wear belts and women wear silk. It is in the shape of a belt. When worn, there must be a scarf, so "Turban." A long object like a scarf or scarf worn on the body is the paradigm of belt.

Original meaning: a long object made of leather, cloth or thread. Such as: straps, belts. Tie, clothes and water.

Extension: extended meaning "a long object like a belt". Such as: strip steel, hairtail fish, vocal cords.

Extension: extended to refer to "area". Such as: zone, temperate zone.

Extension: extended meaning "to wear, to put on". For example: bring filial piety, bring sword.

Extension: Extended meaning "to carry with you". Such as: carry, carry, carry money.

Extension: Extended meaning: "bring along, connect, do by the way". Such as: jointly and severally, jointly and severally, involved (involved). There is a sting in the words.

Extension: extended meaning "contains, presents". Such as: electrified, injured.

Extension: extended meaning "to lead, to guide". Such as: lead, take the lead, lead, lead with one point.

Extension: Extended meaning is "the white mucus secreted by a woman's vagina". Such as: leucorrhea.

Extension: also used as a surname.