# 一昨日
## Japanese
### Etymology 1

Kanji in this term :
| 一 | 昨 | 日 |
| いつ > いっ Grade: 1 | さく Grade: 4 | じつ Grade: 1 |
| kan'on |||
Compound of 一昨 (issaku-, “the previous... before...”) +‎ 日 (jitsu, “day”).
First cited to a text from 1275.

#### Pronunciation

* (Tokyo) いっさくじつ [ìssákúꜜjìtsù] (Nakadaka – [4])
* IPA: [isːa̠kɯ̟ʑit͡sɨ]

#### Noun

一(いっ)昨(さく)日(じつ) • (issakujitsu)
* [from 1275] (formal) the day before yesterday, two days ago

##### See also

* 一昨昨(いっさくさく)日(じつ) (issakusakujitsu, “three days ago”)

### Etymology 2

Kanji in this term :
| 一 | 昨 | 日 |
| おとと | おとと | ひ > い Grade: 1 |
| Grade: 1 | Grade: 4 | ひ > い Grade: 1 |
| jukujikun | jukujikun | kun'yomi |
/wotot͡sufi/ → /wototofi/ → /wototowi/ → /ototoi/
First cited to a text from roughly 953.
Shift from Old Japanese ototsui (see Etymology 3 below).
The kanji spelling is from issakujitsu (see Etymology 1 above).

#### Pronunciation

* (Tokyo) おととい [òtótóꜜì] (Nakadaka –)
* IPA: [o̞to̞to̞i]
* (Tokyo) Note: The word 一昨日 is Nakadaka, however, it is a word that becomes flat with の and is then pronounced as:
   * おとといの

#### Noun

一昨(おとと)日(い) • (ototoi)
* [from c. 953] the day before yesterday, two days ago
** c. 951–953, Gosen Wakashū (book 14, introduction to poem 872)
    かくてつかはしたりければ、千(ち)里(さと)見(み)侍(はべ)りて、まことにをととひなんかへりまうてこしかど、心地(ここち)のなやましくてなむありつる、とはかりいひをくりてはべりければ、かさねてつかはしける
       Kakute tsukawashi-tarikereba, Chisato mihaberite, makoto ni ototoi nan kaeri mōte koshikado, kokochi no nayamashikutenan aritsuru, towakari ii okurite haberikereba, kasanete tsukawashikeru.
       (please add an English translation of this example)

##### Usage notes

Usually spelled in kana alone, rarely written with this kanji spelling.

##### Derived terms

* 一昨日(おととい)御(お)出(い)で (ototoi oide, “go away and don't ever come back”, literally “come here the day before yesterday”)
* 一昨日(おととい)来(こ)い (ototoi koi, “go away and don't ever come back”)
* 一昨昨日(さきおととい) (saki-ototoi, “three days ago”)

### Etymology 3

Kanji in this term :
| 一 | 昨 | 日 |
| おとつ | おとつ | ひ > い Grade: 1 |
| Grade: 1 | Grade: 4 | ひ > い Grade: 1 |
| jukujikun | jukujikun | kun'yomi |
⟨woto$_2$ tu pi$_1$⟩ → */wotətupʲi/ → /wotot͡sufi/ → /otot͡suwi/ → /otot͡sui/
First attested in the Man'yōshū (c. 759 CE).
Originally a compound of 遠 (oto, “distant, distant past”) +‎ つ (tsu, Old Japanese case-marker particle) +‎ 日 (hi, “day”).
The kanji spelling is from issakujitsu (see Etymology 1 above).

#### Pronunciation

* (Tokyo) おとつい [òtótsúꜜì] (Nakadaka –)
* IPA: [o̞to̞t͡sɨi]

#### Noun

一昨(おとつ)日(い) • (ototsui)
* [from circa 759] the day before yesterday, two days ago

##### Usage notes

Usually spelled in kana alone, rarely written with this kanji spelling.

##### Derived terms

* 一昨昨日(さきおとつい) (saki-ototsui, “three days ago”)

### Coordinate terms

時 (“Time”) :
| | ~ | −3 | −2 | −1 | 0 | +1 | +2 | Continual |
| Day | 日 | 一昨昨日 | 一昨日 | 昨日 | 今日 | 明日 | 明後日 | 毎日 |
| Morning | 朝 | — | 一昨朝 | 昨朝 | 今朝 | 明朝 | — | 毎朝 |
| Night | 晩 | — | 一昨晩 | 昨晩 | 今晩 | 明晩 | — | 毎晩 |
| Week | 週 | — | 先々週 | 先週 | 今週 | 来週 | 再来週 | 毎週 |
| Month | 月 | — | 先々月 | 先月 | 今月 | 来月 | 再来月 | 毎月 |
| Year | 年 | 一昨昨年 | 一昨年 | 去年 | 今年 | 来年 | 再来年 | 毎年 |

### See also

* おどでな (ododena, Tsugaru dialect)
* 一(いっ)昨(さく)夕(せき) (issakuseki), 一(いっ)昨(さく)夕(ゆう) (issakuyū)
* 一(いっ)昨(さく)晩(ばん) (issakuban)
* 一(いっ)昨(さく)夜(や) (issakuya)
* 去(きょ)去(きょ)日(じつ) (kyokyojitsu)

### References

* 1 2 3 4 5 6 Matsumura, Akira, editor (2006), 大辞林 [Daijirin] (in Japanese), Third edition, Tokyo: Sanseidō, →ISBN
* 1 2 3 4 Shōgaku Tosho (1988) 国語大辞典（新装版） [Unabridged Dictionary of Japanese (Revised Edition)] (in Japanese), Tōkyō: Shogakukan, →ISBN
* 1 2 3 NHK Broadcasting Culture Research Institute, editor (1998), NHK日本語発音アクセント辞典 [NHK Japanese Pronunciation Accent Dictionary] (in Japanese), Tokyo: NHK Publishing, Inc., →ISBN
* 1 2 Matsumura, Akira (1995) 大辞泉 [Daijisen] (in Japanese), First edition, Tokyo: Shogakukan, →ISBN

## Old Japanese
### Etymology

Compound of 遠 (woto$_2$, “distant past”) +‎ つ (tu, case-marker particle) +‎ 日 (pi$_1$, “day”).

### Noun

一昨日 (woto$_2$tupi$_1$) (kana をとつひ)
* the day before yesterday, two days ago
** c. 759, Man’yōshū, book 17, poem 3924:山乃可比曾許登母見延受乎登都日毛昨日毛今日毛由吉能布禮禮婆yama no$_2$ kapi$_1$ so$_2$ko$_2$ to$_2$ mo mi$_1$yezu woto$_2$tupi$_1$ mo ki$_1$no$_2$pu mo ke$_1$pu mo yuki$_1$ no$_2$ purereba(please add an English translation of this quotation)

#### Descendants

* Japanese: 一昨日 (ototsui, ototoi)