天氣日漸變差。

The weather was getting worse and worse.

Source: Tatoeba

Sentence Composition

1 天氣 tiānqì weather
2 日漸 rìjiàn
  1. to progress (or increase, change etc) day by day
  2. more (or better etc) with each passing day
3 變差 biànchà
  1. (mathematics) variation (term for various concepts related to continuity and measure in mathematical analysis)
  2. to become worse; to worsen; to deteriorate
  3. variation (term for various concepts related to continuity and measure in mathematical analysis)