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Jyutping siu2 si3 ngau4 dou1
Pinyin xiǎo shì niú dāo

Definitions (粵典–words.hk)
  1. 語句
    擁有​好​高​才能​嘅​人​稍微​顯​露一下​佢​嘅​本事
    (of talented people) to show one's talent a bit
    • 煮兩味家常小菜,對佢嚟講只不過係牛刀小試。
      煮两味家常小菜,对佢嚟讲只不过系牛刀小试。
      zyu2 loeng5 mei2 gaa1 soeng4 siu2 coi3, deoi3 keoi5 lai4 gong2 zi2 bat1 gwo3 hai6 ngau4 dou1 siu2 si3.
      For her, cooking two ordinary dishes is just to show a tiny bit of her talent.
  2. 參看
    牛刀小試

小試牛刀 [-试--]

Jyutping
Pinyin xiǎo shì niú dāo

Definitions (CC-CEDICT)
  1. to give a small demonstration of one's impressive skills (idiom)