also: ちょうせき · ちょうじゃく · ぢょうじゃく
noun
Refers to the two times of day, often in contexts like daily routines or greetings.
朝夕は冷え込むので、上着を持っていったほうがいい。
It gets chilly in the morning and evening, so you'd better bring a jacket.
noun, adverb
Used adverbially to mean 'all the time' or 'always'; often with a nuance of continuous effort or worry.
彼は朝夕、研究に打ち込んでいる。
He devotes himself to his research from morning till night.
母は子供の健康を朝夕心配している。
The mother worries about her child's health constantly.