不蒸饅頭爭口氣 [－－馒头争－气]

Jyutping bat1 zing1 maan4 tau4 zang1 hau2 hei3
Pinyin bù zhēng mán tou zhēng kǒu qì

Definitions (CC-CEDICT)
  1. not to be crushed (idiom)
  2. to be determined to have one's revenge