morning and evening; every morning and evening; constantly
Literary or poetic expression for something that happens repeatedly, morning and evening; often implies a habitual, unchanging routine. Can be used adverbially without a particle.
Gazing at the sea morning and evening is my daily routine.
彼は朝な夕な、亡き妻の写真に語りかけた。
Morning and evening, he spoke to the photo of his late wife.