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.
The next morning, he woke up early.
The morning after the incident, the police came.
Mixed kanji-kana spelling; less common than 明くる朝 but still encountered.
Combination of the classical attributive form 明くる (akuru, 'next/following') of the verb 明く (aku, 'to dawn') and 朝 (asa, 'morning').