竹籃打水一場空 [－篮－－－场－]

Jyutping zuk1 laam4 daa2 seoi2 jat1 coeng4 hung1
Pinyin zhú lán dǎ shuǐ yī chǎng kōng

Definitions (Wiktionary)
  1. phrase, idiomatic
    as futile as drawing water with a bamboo basket