一葉知秋 [－叶－－]

Jyutping jat1 jip6 zi1 cau1
Pinyin yī yè zhī qiū

Definitions (CC-CEDICT)
  1. lit. the falling of one leaf heralds the coming of autumn (idiom)
  2. fig. a small sign can indicate a great trend
  3. a straw in the wind
Definitions (粵典–words.hk)
  1. 語句
    由細​微​嘅​徵​兆​可以​預測​事物​嘅​發​展​。
    Use a subtle omen to predict the trend of something
    • 從呢件小事上佢嚴厲嘅態度可以一葉知秋，同學仔未來會過得好艱難。
      从呢件小事上佢严厉嘅态度可以一叶知秋，同学仔未来会过得好艰难。
      From his demanding attitude in this trivial matter, we can predict that students will have a hard time.
Definitions (Wiktionary)
  1. phrase, idiomatic
    a small sign can indicate a great trend
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）
Examples (粵典–words.hk)
  1. Cantonese
    从呢件小事上佢严厉嘅态度可以一叶知秋，同学仔未来会过得好艰难。
    從呢件小事上佢嚴厲嘅態度可以一葉知秋，同學仔未來會過得好艱難。
    • From his demanding attitude in this trivial matter, we can predict that students will have a hard time.