Definition
天长日久 is a four-character idiom (成语) meaning 'after a long time' or 'as time goes on'. It emphasizes the gradual, cumulative effect of time passing — things that change or become apparent only after many days and months. You use it to describe processes, habits, or relationships that develop slowly over an extended period, not for short durations.
f.e.
as time goes onafter a long period of time
Examples
- 天长日久，。tiān cháng, tāmen de yǒuyì yuè lái yuè shēn.As time goes on, their friendship grows deeper and deeper.
- 天长日久，。tiān cháng, zhège xíguàn jiù yǎngchéng le.After a long time, this habit will be formed.
- 天长日久，。tiān cháng, tā mànman xuéhuì le nàixīn.Over the long course of time, he gradually learned patience.
Browse more HSK 7-9 words or search the full 43,000-word dictionary.