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