一いっ朝ちょう一いっ夕せき

noun

in a day; in a short time

Almost always used in negative constructions (e.g., 一朝一夕には…ない) to mean that something cannot be achieved quickly or easily. Common in formal and written contexts.

• 語ご学がくの習しゅう得とくは一いっ朝ちょう一いっ夕せきにはいかない。

  Mastering a language cannot be done overnight.

• この問もん題だいは一いっ朝ちょう一いっ夕せきで解かい決けつできるものではない。

  This problem cannot be solved in a day.