# 開口
## Chinese
### Pronunciation

* Mandarin
    (Pinyin): kāikǒu
    (Zhuyin): ㄎㄞ ㄎㄡˇ
* Cantonese (Jyutping): hoi$^1$ hau$^2$
* Hakka (Sixian, PFS): khôi-khiéu
* Southern Min (Hokkien, POJ): khai-kháu / khai-khió / khui-kháu
* Wu (Shanghai, Wugniu): $^1$khe-kheu$_5$
* Mandarin
** (Standard Chinese)
*** Hanyu Pinyin: kāikǒu
*** Zhuyin: ㄎㄞ ㄎㄡˇ
*** Tongyong Pinyin: kaikǒu
*** Wade–Giles: kʻai$^1$-kʻou$^3$
*** Yale: kāi-kǒu
*** Gwoyeu Romatzyh: kaikoou
*** Palladius: кайкоу (kajkou)
*** Sinological IPA : /kʰaɪ̯⁵⁵ kʰoʊ̯²¹⁴⁻²¹⁽⁴⁾/
* Cantonese
** (Standard Cantonese, Guangzhou–Hong Kong)
*** Jyutping: hoi$^1$ hau$^2$
*** Yale: hōi háu
*** Cantonese Pinyin: hoi$^1$ hau$^2$
*** Guangdong Romanization: hoi$^1$ heo$^2$
*** Sinological IPA : /hɔːi̯⁵⁵ hɐu̯³⁵/
* Hakka
** (Sixian, incl. Miaoli and Neipu)
*** Pha̍k-fa-sṳ: khôi-khiéu
*** Hakka Romanization System: koi$^ˊ$ kieu$^ˋ$
*** Hagfa Pinyim: koi$^1$ kieu$^3$
*** Sinological IPA: /kʰoi̯²⁴ kʰi̯eu̯³¹/
* Southern Min
** (Hokkien: Xiamen, Zhangzhou, General Taiwanese)
*** Pe̍h-ōe-jī: khai-kháu
*** Tâi-lô: khai-kháu
*** Phofsit Daibuun: qai'qao
*** IPA (Xiamen, Zhangzhou): /kʰai⁴⁴⁻²² kʰau⁵³/
*** IPA (Kaohsiung): /kʰai⁴⁴⁻³³ kʰau⁴¹/
*** IPA (Taipei): /kʰai⁴⁴⁻³³ kʰau⁵³/
** (Hokkien: Quanzhou)
*** Pe̍h-ōe-jī: khai-khió
*** Tâi-lô: khai-khió
*** Phofsit Daibuun: qai'qioir
*** IPA (Quanzhou): /kʰai³³ kʰio⁵⁵⁴/
** (Hokkien: Xiamen, Quanzhou, Zhangzhou)
*** Pe̍h-ōe-jī: khui-kháu
*** Tâi-lô: khui-kháu
*** Phofsit Daibuun: qui'qao
*** IPA (Quanzhou): /kʰui³³ kʰau⁵⁵⁴/
*** IPA (Xiamen, Zhangzhou): /kʰui⁴⁴⁻²² kʰau⁵³/
* Wu
** (Northern: Shanghai)
*** Wugniu: $^1$khe-kheu$_5$
*** MiniDict: khe$^平$ kheu$^去$
*** Wiktionary Romanisation (Shanghai): $^1$khe-kheu$_2$
*** Sinological IPA (Shanghai): /kʰe⁵⁵ kʰɤ²¹/

### Verb

開口
* to open one's mouth; (impersonal) to have an opening
    Synonyms: 動嘴 / 动嘴 (dòngzuǐ), (literary) 啟齒 / 启齿 (qǐchǐ)
    開著口睡覺／开着口睡觉 ― kāi zhe kǒu shuìjiào ― sleep with their mouth open
    開著口的書包／开着口的书包 ― kāi zhe kǒu de shūbāo ― open schoolbag
    開著口的隧道／开着口的隧道 ― kāi zhe kǒu de suìdào ― gaping tunnel
* to start talking or singing
    Synonyms: 動嘴 / 动嘴 (dòngzuǐ), (literary) 啟齒 / 启齿 (qǐchǐ)
       Tā yī kāikǒu, quánchǎng dōu ānjìng le. [Pinyin]
       The whole arena hushed as they began to sing.
* to speak up (to dare to speak)
    不敢開口表白／不敢开口表白 ― bùgǎn kāikǒu biǎobái ― is too shy to (speak up and) confess one's love
    唔噉開口問／唔噉开口问 [Cantonese] ― m$^4$ gam$^2$ hoi$^1$ hau$^2$ man$^6$ [Jyutping] ― is too shy to dare ask
* to laugh out loud
* to crack open
* to sharpen (a new knife or pair of scissors) before use
    Synonyms: see Thesaurus:開刃
* to breach a dam
* (literary) to eat

#### Derived terms

* 開口閉口 / 开口闭口 (kāikǒubìkǒu)

### Noun

開口
* opening
* (Chinese phonetics) Short for 開口呼／开口呼 (kāikǒuhū, “open-mouth sounds”).
* (aviation) open jaw

## Japanese

Kanji in this term :
| 開 | 口 |
| かい Grade: 3 | こう Grade: 1 |
| on'yomi ||

### Pronunciation

* IPA: [ka̠iko̞ː]

### Noun

開(かい)口(こう) • (kaikō)
* an opening such as an open window
* opening one's mouth and starting to speak

### Verb

開(かい)口(こう)する • (kaikō suru) suru (stem 開(かい)口(こう)し (kaikō shi), past 開(かい)口(こう)した (kaikō shita))
* open one's mouth (and begin to speak)

#### Conjugation

Katsuyōkei ("stem forms") :
| Mizenkei ("imperfective") | 開口し | かいこうし | kaikō shi |
| Ren’yōkei ("continuative") | 開口し | かいこうし | kaikō shi |
| Shūshikei ("terminal") | 開口する | かいこうする | kaikō suru |
| Rentaikei ("attributive") | 開口する | かいこうする | kaikō suru |
| Kateikei ("hypothetical") | 開口すれ | かいこうすれ | kaikō sure |
| Meireikei ("imperative") | 開口せよ¹ 開口しろ² | かいこうせよ¹ かいこうしろ² | kaikō seyo¹ kaikō shiro² |
| Key constructions ||||
| Passive | 開口される | かいこうされる | kaikō sareru |
| Causative | 開口させる 開口さす | かいこうさせる かいこうさす | kaikō saseru kaikō sasu |
| Potential | 開口できる | かいこうできる | kaikō dekiru |
| Volitional | 開口しよう | かいこうしよう | kaikō shiyō |
| Negative | 開口しない | かいこうしない | kaikō shinai |
| Negative continuative | 開口せず | かいこうせず | kaikō sezu |
| Formal | 開口します | かいこうします | kaikō shimasu |
| Perfective | 開口した | かいこうした | kaikō shita |
| Conjunctive | 開口して | かいこうして | kaikō shite |
| Hypothetical conditional | 開口すれば | かいこうすれば | kaikō sureba |
| ¹ Written imperative ² Spoken imperative ||||