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Seal Western Han 202 BC-9 AD 
Seal Shuowen ~100 AD 
Clerical Qin 221-206 BC 
Clerical Western Han 202 BC-9 AD 
Clerical Western Han 202 BC-9 AD 
Clerical Eastern Han 25-220 AD Regular Modern
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Original meaning: arrow nock
Origin unclear. Variously explained as an arrow nock or the space between two legs. Either way, the original form is unrelated to the current meaning.
Character Evolution
Historical Pronunciations
| Middle Chinese | Old Chinese | Gloss | |
|---|---|---|---|
| Baxter-Sagart | kjuwX | [k]ʷəʔ | a long time |
說文解字
《說文》：“久，以後灸之，象人兩脛後有距也。”
Sources
- Character origin
- 漢語多功能字庫
- Readings & variants
- Unicode
- Historical pronunciations
- Baxter-Sagart
- Historical images
- Academia Sinica
- Etymology
- Shuowen Jiezi (說文解字)