noun, adverb
next morning; the following morning
Refers to the morning after a specific day or event. Often used in narrative or slightly formal contexts. The reading あくるあした is less common and somewhat literary.
あくる朝、彼は早く起きた。
The next morning, he woke up early.
事件のあくる朝、警察が来た。
The morning after the incident, the police came.
翌朝 is the standard, everyday word for 'next morning'. 明くる朝 is slightly more literary or emphatic, often used in storytelling.
Combination of the classical attributive form 明くる (akuru, 'next/following') of the verb 明く (aku, 'to dawn') and 朝 (asa, 'morning').