老鼠拖木鍁，大頭在後頭 [－－－－锨－－头－后头]

Jyutping lou5 syu2 to1 muk6 hin1 , daai6 tau4 zoi6 hau6 tau4
Pinyin lǎo shǔ tuō mù xiān , dà tóu zài hòu tou

Definitions (CC-CEDICT)
  1. when the mice drag a shovel, the biggest thing comes second
  2. the tip of the iceberg
  3. the cockroach principle