A short period of time; overnight (often used in negative constructions to indicate that something cannot be accomplished quickly).
朝早晨；夕晚上。一个早晨或一个晚上。形容很短的时间。
《周易·坤》臣弑其君，子弑其父，非一朝一夕之故，其所由来者渐矣。”
It takes time to learn a language; it cannot be mastered in a day.
Learn the next connected idiom: 一朝一夕 (yī zhāo yī xī) → 夕阳西下 (xī yáng xī xià)
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