寸

寸 (Kangxi radical 41, 寸+0, 3 strokes, cangjie input 木戈 (DI), four-corner 4030₀, composition ⿹𬺰丶)

1. Kangxi radical #41, ⼨.

• Appendix:Chinese radical/寸
• 付, 吋, 忖, 过, 时, 村, 肘, 衬, 籿, 紂(纣), 耐, 䖞, 䙸, 討(讨), 酎, 屗
• 刌, 夺, 守, 寺, 䒭, 䙷, 辱, 奪, 疛, 団, 埓, 㷉

• す

• Kangxi Dictionary: page 293, character 32
• Dai Kanwa Jiten: character 7411
• Dae Jaweon: page 581, character 4
• Hanyu Da Zidian (first edition): volume 1, page 503, character 8
• Unihan data for U+5BF8

Shuowen considered it an ideogram (指事) – a position on the forearm where the pulse can be palpated by compressing the radial artery. It is called 寸口 in modern Chinese, and the meaning of a unit of measurement is derived from the distance between the wrist and this position. Compare 又, 手, 九, 爪.

However, it may be an abbreviated form of 尊 (zūn), borrowed to mean a unit of measurement (see: 李轶.先秦度量单位"尺""寸"用字考[J].云南师范大学学报(哲学社会科学版), 2010, 42(5).DOI:10.3969/j.issn.1000-5110.2010.05.017.)

寸

1. (units of measure) A cun or Chinese inch, a traditional unit of length of about 3 cm.
   1. (Mainland China) short for 市寸 (shìcùn)
   2. (Hong Kong) Legally defined as the tsun of 3.71475 cm.
2. (informal) short for 英寸 (yīngcùn, “inch”)
3. (figurative) very short or little
4. (traditional Chinese medicine) cunkou pulse; radial artery pulse at the wrist
5. (Mandarin, colloquial) coincidental; unbelievable; opportune
6. a surname

• 分 (fēn, “¹⁄₁₀ cun”)
• 尺 (chǐ, “10 cun”)

寸

1. (Cantonese) alternative form of 串

• “寸”, in 漢語多功能字庫 (Multi-function Chinese Character Database)‎^[1], 香港中文大學 (the Chinese University of Hong Kong), 2014–

(Sixth grade kyōiku kanji)

• Go-on: すん (sun, Jōyō)
• Kan-on: そん (son)
• Kun: き (ki)
• Nanori: す (su)、みき (miki)

From Middle Chinese 寸 (MC tshwonH).

• (Tokyo) すん [súꜜǹ] (Atamadaka – [1])^[1]
• IPA^(key): [sɨ̃ɴ]

寸(すん) • (sun) 

1. a Japanese measurement of length equivalent to 10 分 (bu) or approximately 3.03 cm
2. (by extension) a length, measurement
3. shortness, fewness
4. (historical) the fee of a 局女郎 (tsubone-jorō), set at one momme or 100 mon

• English: sun

• 分(ぶ) (bu)
• 尺(しゃく) (shaku)

寸(すん) • (sun) 

1. sun (measurement of length)
2. (by extension) length, measurement
3. minimal, negligible

From Old Japanese.

• IPA^(key): [kʲi]

寸(き) • (-ki) 

1. (archaic) unit used in ancient times to measure lengths of horses

• 八(や)寸(き) (yaki)

From Middle Chinese 寸 (MC tshwonH).

• (SK Standard/Seoul) IPA^(key): [t͡ɕʰo̞(ː)n]
• Phonetic hangul: [촌(ː)]
  • Though still prescribed in Standard Korean, most speakers in both Koreas no longer distinguish vowel length.

Wikisource

寸 (eumhun 마디 촌 (madi chon))

1. hanja form^? of 촌 (“degree of kinship”) [noun]

• 국제퇴계학회 대구경북지부 (國際退溪學會 大邱慶北支部) (2007). Digital Hanja Dictionary, 전자사전／電子字典. [3]

(Sixth grade kyōiku kanji)

• On (unclassified): しん (shin)^{←すぃん (sin, historical)}

Cognate with mainland Japanese 寸 (sun).

• (Shuri-Naha) し​ん [shíꜜn] (Kakō - [1])
• IPA^(key): [ɕiɴ]

寸(しん) (shin) ^{←すぃん (sin)?}

1. a measurement of length equivalent to 10 分 (bu) or approximately 3.03 cm

• 分(ぶ) (bu)
• 尺(しゃく) (shaku)

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

寸 (-ki₁) (kana き)

1. ancient measurement of length equivalent to the modern Japanese sun or approximately 3.03 centimeters

• Japanese: 寸 (-ki)

寸: Hán Việt readings: thốn^{[1][2][3][4][5][6]}
寸: Nôm readings: thốn^[1][2][3], xốn^[2][3], thổn^[1], dón^[3], són^[3], thuỗn^[3]

1. chữ Hán form of thốn (“cun, a unit of length”)