Refers to the early morning hours. Often used in the phrase 朝腹に (in the early morning).
See also: 朝っぱら
Taking a walk in the early morning is my daily routine.
empty stomach in the morning
Archaic term for an empty stomach before breakfast. Rarely used in modern Japanese.
triviality; simple matter
Archaic meaning referring to something trivial or easy, often used in the phrase 朝腹の (trivial).
That is a trivial matter.
It is said that people in the past took medicine on an empty stomach in the morning.
The word 朝腹 is composed of 朝 (morning) and 腹 (stomach). The exact historical derivation is uncertain, but the meanings likely developed from the idea of the morning stomach (empty stomach) to early morning and then to triviality.