HanziGuru.酷 · kù
酷
kù[ku4]Tone 4

cool / ruthless

HSK 6
Guru Deep Dive

English · cool / ruthless

Cached lesson
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Topology:Left-right
Strokes:14
Writing Balance Rule: The left side (酉) is slightly narrower, while the right side (告) provides the wide structural foundation. Keep the vertical lines straight and parallel.
1. Meaning

cool, hip (loanword from English)

ruthless, cruel, severeextremely strong (of wine or taste)
AdjectiveColloquial / Slang for the modern sense; literary for the ruthless sense#personality#slang#modern culture#intensity
Sample Usage
  • 他穿这件衣服看起来很酷。
    tā chuān zhè jiàn yīfú kàn qǐlái hěn kù.
    He looks very cool wearing this outfit.
  • 这首歌太酷了！
    zhè shǒu gē tài kù le!
    This song is so cool!
2. Sound
/[kʰu˥˩]/Tone: 51
酷
kùku4
++
`(51)
=kù
Initial Consonant
k
Type: Aspirated Velar
Sounds like: k sound as in 'key' or 'cat'
Aspirated
Airflow Tactile Test: Strong gust of air from throat! Tissue held in front MUST fly forward.
Tongue & Mouth Position: Back of tongue raised against the soft palate, releasing a strong puff of air
Final Rhyme
u
Vowel Group: -u vowel group
Sounds like: oo sound as in 'boot' or 'coo'
Mouth Shape Guide: Pronounce as standalone vowel 'oo'.
Common Learner Trap: Keep vowel quality steady across all 4 tone contours.
Tone
T4 (51)
4th Tone (High-Falling)
Tone Pitch & Cadence: Tone 4 starts high and drops abruptly to the bottom, similar to saying 'No!' or 'Stop!' in English.
👂
Listening trap: Confusing it with Tone 1 (kū) or Tone 2 (kú). Make sure the pitch drops steeply like an angry command.
👋
Physical Tone Gesture: A sharp karate chop starting high in the air and slicing straight down to the floor.
3. Writing

Topology: Left-right · Strokes: 14 strokes

Writing Balance Rule: The left side (酉) is slightly narrower, while the right side (告) provides the wide structural foundation. Keep the vertical lines straight and parallel.

4. Components

Radical 酉 · Wine jar radical (Wine, alcohol, fermentation)

Semantic Clue (形旁): 酉 (Indicates extreme fermentation, harshness, or strong spirits)

Phonetic Clue (声旁): 告 (original sound: gào)

A wine jar (酉) that makes a loud proclamation or warning (告) because it contains wine so strong and fierce that it knocks you out.

  • 酉 Wine jar / radical meaning severity or strong brew
  • 告 To tell / phonetic clue for sound
5. History
Liushu category: Phono-semantic (形声)

Origin: Originally combined the wine vessel radical (酉) with the sound-bearer (告). It originally denoted harsh, severe, or cruel conditions (like potent, harsh alcohol), but in the late 20th century, it was brilliantly adopted as a phonetic and semantic loanword to represent the English word 'cool'.

Semantic Evolution: From cruel/harsh/severe wine ➔ extreme intensity ➔ modern slang meaning 'cool' or 'hip'.

  • This is one of the most successful phonetic loanwords in modern Mandarin, perfectly matching both the sound of English 'cool' and a sense of striking intensity.
6. Sinosphere
Sound Shift Bridge: The Mandarin reading 'kù' sounds remarkably close to the English loanword 'cool' (ku-ru in Japanese), making it an intuitive bridge for global learners.
7. Memory
Vivid Mnemonic Story

Picture a **cool** rockstar holding a jar of extremely strong wine (**酉**) and **telling** everyone (**告**) about his latest hit song with a fierce, sharp attitude.

Phonetic Family (形声字家族)
告
gàoto tell, announceBase phonetic component without the wine jar radical.
造
zàoto create, makeReplaces the wine jar with the movement radical (辶).
Lookalikes & Traps (形近字)
枯(kū)
Has the tree radical (木) instead of wine (酉), meaning withered or dried up.
哭(kū)
Has mouth elements at the bottom instead of the wine jar, meaning to cry.
8. Mastery
Active Recall Challenge
他今天穿的新衣服真的很[___]。
Clue: kù
Common Learner Pitfall

Confusing the Tone 4 drop (kù) with Tone 1 (kū - withered/cry), or forgetting the left-side radical is 酉 (wine jar) rather than 日 (sun).

Memory Prompts
Recognition: When you see the character 酷, what are its two primary contrasting semantic areas?
Production: How do you write the character for 'cool / ruthless' (kù) using the wine jar radical?
Real-World Video Context

Watch authentic native speakers pronounce and explain this word in real-world YouTube videos.

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