明後日

/asate/ → /asat̚te/

Shift from earlier asate (see Etymology 2 below).^[1][2]

The kanji spelling is from myōgonichi (see Etymology 3 below).

• (Tokyo) あさって [àsáꜜttè] (Nakadaka – [2])^[3]
• IPA^(key): [a̠sa̠t̚te̞]

明後日(あさって) • (asatte) 

1. (colloquial) the day after tomorrow

• 明日(あす)明後日(あさって) (asu-asatte)
• 明明後日(しあさって) (shiasatte)
• 弥(や)の明後日(あさって) (yanoasatte), 弥(や)な明後日(あさって) (yanaasatte)

• 明後日(あさって)の方(ほう)を向(む)く (asatte no hō o muku)

• 明後日(あさって)紺(こう)屋(や)に今(こん)度(ど)鍛冶(かじ)屋(や) (asatte kōya ni kondo kajiya)
• 紺(こう)屋(や)の明後日(あさって) (kōya no asatte)

/asu sarite/ → /asːarʉte/ → /asate/

Apparently recorded in the 名語記 (Myōgoki) etymology dictionary of 1263 as a shift from asusate, in turn from 明日去りて (asu sarite), itself a compound of 明日 (asu, “tomorrow”) +‎ 去りて (sarite, modern 去って (satte), the conjunctive form of 去る (saru), “to pass”).^[4]

The kanji spelling is from myōgonichi (see Etymology 3).

明後日(あさて) • (asate) 

1. (archaic) the day after tomorrow
   • c. 1001–1014, Murasaki Shikibu, Genji Monogatari (Akashi)

     あさてばかりになりて、例(れい)のやうにいたくもふかさで渡(わた)りたまへり。

     Asate bakari ni narite, rei no yō ni itaku mo fukasa de watari-tamaeri.

     (please add an English translation of this example)

• 明後日(あさって) (asatte, see above)
• 明日(あす)明後日(あさて) (asu-asate)

From 明後 (myōgo-, “the ... after next ...”) +‎ 日 (nichi, “day”).

• (Tokyo) みょーごにち [myòógóꜜnìchì] (Nakadaka – [3])^[3]
• IPA^(key): [mʲo̞ːɡo̞ɲ̟it͡ɕi]

明(みょう)後(ご)日(にち) • (myōgonichi) ^{←みやうごにち (myaugoniti)?}

1. (formal) the day after tomorrow

   Synonym: 明後 (myōgo)

• 明(みょう)明(みょう)後(ご)日(にち) (myōmyōgonichi)

• 翌(よく)翌(よく)日(じつ) (yokuyokujitsu)